Power supply circuit

Abstract

The utility model provides a kind of power supply circuit, comprising: power supply module, power supply module is in the gating state when enable signal is first level, output power voltage;And in enable signal is second level, in the disconnected state;Direct current module is coupled with power supply module, direct current module is in triggered state, based on power voltage, generate direct current voltage;Switch module is coupled with direct current module and power supply module respectively, for in response to direct current voltage and the power voltage, the passway between gating power supply module to output end;And for in response to freewheeling voltage, the passway between gating power supply module to the output end;Charging and discharging module is coupled with switch module and output end respectively, for when direct current module is triggered, convert and store the electric energy of output end;And when direct current module is not triggered, provide freewheeling voltage to switch module.Using the above technical scheme, the adaptability of power supply equipment and electric equipment can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery management technology, and in particular to a power supply circuit. Background Technology

[0002] With the rapid development of the new energy industry, the market for uninterruptible power supplies (UPS) and home energy storage is booming. These products are equipped with multiple DC power output ports to provide power to mobile devices or home appliances.

[0003] Currently, these battery products are sold as a package, including power supply equipment and electrical appliances such as lights, DC fans, and televisions. The purpose of this package is to ensure that the electrical appliances use their own power supply equipment, thereby guaranteeing the stability of their operation.

[0004] However, end users often use incompatible power supply equipment to power their electrical devices, which makes it impossible to guarantee the operational stability of the electrical devices. Utility Model Content

[0005] In view of this, the present invention provides a power supply circuit that can improve the compatibility between power supply equipment and electrical equipment, and improve the working stability of electrical equipment.

[0006] This utility model provides a power supply circuit, including:

[0007] A power supply module, wherein the input terminal of the power supply module is used to receive an enable signal, and when the enable signal is at a first level, the power supply module is in a selected state and outputs a power supply voltage; and when the enable signal is at a second level, the power supply module is in a disconnected state.

[0008] A DC blocking module is coupled to the power supply module. The DC blocking module is in a triggered state and generates a DC blocking voltage based on the power supply voltage.

[0009] A switching module, coupled to the DC blocking module and the power supply module respectively, is used to select the path between the power supply module and the output terminal in response to the DC blocking voltage and the power supply voltage; and to select the path between the power supply module and the output terminal in response to the freewheeling voltage;

[0010] The charging and discharging module is coupled to the switching module and the output terminal respectively, and is used to convert and store the electrical energy of the output terminal when the DC blocking module is triggered; and to provide the freewheeling voltage to the switching module when the DC blocking module is not triggered.

[0011] Optionally, the power supply module includes:

[0012] Power supply, used to provide the power supply voltage;

[0013] A gating unit is coupled to the power supply, the DC blocking module, and the switching module respectively. The input terminal of the gating unit is used to receive the enable signal, and when the enable signal is at the first level, it selects the path between the power supply and the DC blocking module, and selects the path between the power supply and the switching module; and when the enable signal is at the second level, it disconnects the path between the power supply and the DC blocking module, and disconnects the path between the power supply and the switching module.

[0014] Optionally, the power supply circuit satisfies at least one or more of the following:

[0015] The gating module includes a first resistor and a first transistor. A first end of the first resistor is adapted to receive the enable signal, and a second end of the first resistor is connected to the control terminal of the first transistor. A first end of the first transistor is coupled to the power supply, a first ground terminal, the DC blocking module, and a switching module, respectively, and a second end of the first transistor is coupled to a second ground terminal.

[0016] The enable signal is a square wave signal.

[0017] Optionally, the DC blocking module includes a tactile switch and a DC blocking capacitor, wherein: a first end of the tactile switch is adapted to input a trigger signal, a second end of the tactile switch is connected to the power supply module, a third end of the tactile switch is connected to the first end of the DC blocking capacitor, and a second end of the DC blocking capacitor is connected to the switch module.

[0018] Optionally, the switching module includes:

[0019] A switching unit, coupled to the DC blocking module and the charging / discharging module respectively, is adapted to be in a selected state and output a first voltage when the DC blocking module is triggered, based on the DC blocking voltage and the power supply voltage; and to be in a selected state and output a second voltage when the DC blocking module is not triggered, based on the freewheeling voltage.

[0020] The holding unit is coupled to the switching unit and the power supply module respectively, and is adapted to be in a selected state in response to the first voltage or the second voltage.

[0021] Optionally, the power supply circuit satisfies at least one or more of the following:

[0022] The switching unit includes a first transistor, the base of which is coupled to the DC blocking module and the charging / discharging module respectively, the emitter of which is grounded, and the collector of which is coupled to the holding unit.

[0023] The holding unit includes a second transistor, the control terminal of the second transistor is coupled to the switching unit, the first terminal of the second transistor is coupled to the power supply module, and the third terminal of the second transistor is coupled to the output terminal.

[0024] A first current-limiting resistor is disposed between the switching unit and the DC blocking module;

[0025] A second current-limiting resistor is disposed between the switching unit and the holding unit;

[0026] The second resistor has its first end disposed between the switching unit and the power supply module, and its second end coupled to the switching unit.

[0027] Optionally, the output terminal includes a first output terminal and a second output terminal, and the voltage types of the first output terminal and the second output terminal are different;

[0028] The charging and discharging module includes: a rectifier unit, a charging and discharging unit, and a freewheeling unit, wherein:

[0029] The rectifier unit is coupled between the first output terminal and the second output terminal, and is also coupled to the charging and discharging unit, for converting the type of power supply voltage;

[0030] The charging and discharging unit is coupled to the second output terminal and is used to store the converted electrical energy of the second output terminal when the DC blocking module is triggered; and to release the stored electrical energy to generate the freewheeling voltage when the DC blocking module is not triggered.

[0031] The freewheeling unit is coupled to the first output terminal, the charging / discharging unit, and the switching module, respectively. It is adapted to be in an off state when the DC blocking module is triggered, based on the voltage corresponding to the first output terminal; and to be in a conducting state when the DC blocking module is not triggered, based on the freewheeling voltage and the voltage corresponding to the first output terminal, so as to select the path between the charging / discharging unit and the switching module.

[0032] Optionally, the power supply circuit satisfies at least one or more of the following:

[0033] The rectifier unit includes: a rectifier diode, the first end of which is coupled to the switching module, and the second end of which is coupled to the charging and discharging unit;

[0034] The charging and discharging unit includes a first capacitor and / or a second capacitor, wherein a first terminal of the first capacitor is coupled to a first terminal of the second capacitor and a second output terminal, respectively; and the second terminals of the first capacitor and the second capacitor are grounded.

[0035] The freewheeling unit includes: a second transistor, the base of which is coupled to the first output terminal, the emitter of which is coupled to the charging and discharging unit, and the collector of which is coupled to the switching module.

[0036] Optionally, the power supply circuit satisfies at least one or more of the following:

[0037] A third current-limiting resistor is disposed between the freewheeling unit and the switching module;

[0038] A fourth current-limiting resistor is disposed between the freewheeling unit and the first output terminal.

[0039] The third capacitor has its first terminal disposed between the third current-limiting resistor and the freewheeling unit, and its second terminal grounded.

[0040] Optionally, the power supply circuit satisfies at least one or more of the following:

[0041] The DC blocking voltage serves as a switching signal, which is used to adjust the gear of the first type of load.

[0042] The DC blocking voltage serves as a control signal, which is used to select or cut off the path between the output and input terminals of the power supply circuit.

[0043] The third resistor has its first end positioned between the switch module and the output terminal, and its second end grounded.

[0044] Compared with the prior art, the technical solution of this utility model embodiment has the following advantages:

[0045] The power supply circuit provided by this invention, based on the level state of the enable signal, allows the power supply module to have both a selected state and an open state. When the power supply module is in the selected state, it can output a power supply voltage. Thus, when the DC blocking module is in the triggered state, it can generate a DC blocking voltage based on the power supply voltage, thereby enabling the switching module to operate and selecting the path between the power supply module and the output terminal, allowing the electrical equipment to operate normally. During this process, the charging and discharging module can store electrical energy at the output terminal. When the power supply module is in the open state, the output voltage is zero, and the DC blocking module is not triggered. At this time, the charging and discharging module is in the discharging state, providing a freewheeling voltage to the switching module, allowing the path between the power supply module and the output terminal to be selected, and the electrical equipment to operate normally. By configuring the coordination relationship of the modules in the above power supply circuit, DC electrical equipment will not operate using pure DC power; only compatible power supply equipment and electrical equipment can operate normally. This improves the compatibility of the power supply equipment and electrical equipment, and enhances the stability of the electrical equipment. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of a power supply circuit in one embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the power supply module in one embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of the specific structure of a power supply circuit in one embodiment of the present invention. Detailed Implementation

[0050] As described in the background section, some end users use incompatible power supply equipment to power their electrical devices, which reduces the operational stability of the electrical devices.

[0051] At this point, a method is needed to ensure that only compatible power supply equipment can supply power to the electrical equipment, and that the electrical equipment can only work if it uses compatible power supply equipment.

[0052] More specifically, this utility model provides a power supply circuit in which the power supply module has a selected state and an open state based on the level state of the enable signal. When the power supply module is in the selected state, it can output a power supply voltage. Thus, when the DC blocking module is in the triggered state, it can generate a DC blocking voltage based on the power supply voltage, thereby enabling the switching module to operate and selecting the path between the power supply module and the output terminal, allowing the electrical equipment to operate normally. During this process, the charging and discharging module can store electrical energy at the output terminal. When the power supply module is in the open state, the output voltage is zero, and the DC blocking module is not triggered. At this time, the charging and discharging module is in the discharging state, providing a freewheeling voltage to the switching module, allowing the path between the power supply module and the output terminal to be selected, and the electrical equipment to operate normally. By configuring the cooperative relationship of the modules in the above power supply circuit, DC electrical equipment will not operate using pure DC power; only compatible power supply equipment and electrical equipment can operate normally. This improves the compatibility of the power supply equipment and electrical equipment and enhances the operational stability of the electrical equipment.

[0053] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described below with reference to the accompanying drawings.

[0054] This utility model provides a power supply circuit, such as Figure 1 The diagram shown is a structural schematic of a power supply circuit in one embodiment of the present invention. Figure 1 As shown, the power supply circuit may include:

[0055] The power supply module U1 has an input terminal for receiving an enable signal EN. When the enable signal EN is at a first level, the power supply module U1 is in a selected state and outputs a power supply voltage; and when the enable signal EN is at a second level, the power supply module U1 is in a disconnected state.

[0056] DC blocking module U2 is coupled to the power supply module U1. When DC blocking module U2 is in a triggered state, it generates DC blocking voltage based on the power supply voltage.

[0057] Switch module U3 is coupled to DC blocking module U2 and power supply module U1 respectively, and is used to select the path between power supply module U1 and output terminal OUT in response to DC blocking voltage and power supply voltage; and to select the path between power supply module U1 and output terminal OUT in response to freewheeling voltage;

[0058] The charging and discharging module U4 is coupled to the switching module U3 and the output terminal OUT, respectively, and is used to convert and store the electrical energy of the output terminal OUT when the DC blocking module U2 is triggered; and to provide the freewheeling voltage to the switching module U3 when the DC blocking module U2 is not triggered.

[0059] Specifically, the enable signal EN can have a first level (e.g., high level "1") and a second level (e.g., high level "0"). When the enable signal EN has the first level, the power supply module U1 is in the selected state, and the power supply module U1 can provide power voltage to the electrical equipment, so that the electrical equipment can work normally.

[0060] When power supply module U1 is in the selected state, it triggers DC blocking module U2, causing U2 to switch from the off state to the on state. This allows DC blocking module U2 to filter the DC component in the power supply voltage, providing DC blocking voltage to switch module U3. Switch module U3 then activates, selecting the path between power supply module U1 and the output terminal OUT, allowing the electrical equipment to obtain the power supply voltage.

[0061] During this process, the charge / discharge module U4 can perform energy storage operations on the power supply voltage.

[0062] While power supply module U1 remains in either the on or off state, DC blocking module U2, upon triggering, immediately switches from the on to the off state, thus failing to provide DC blocking voltage to switch module U3. At this time, charging / discharging module U4 can perform a discharging operation, providing freewheeling voltage to switch module U3. Under the influence of this freewheeling voltage, switch module U3 can operate again, enabling the path between power supply module U1 and output terminal OUT, allowing the electrical equipment to operate normally.

[0063] In other words, by setting up the DC blocking module U2 and the charging and discharging module U4, different modules can be selected to provide voltage to the switching module U3 under different conditions, so that the switching module U3 can operate, enabling the power supply equipment and electrical equipment with matching relationships to work normally. This improves the compatibility of the power supply equipment and electrical equipment and enhances the working stability of the electrical equipment.

[0064] It should be noted that, firstly, the values ​​of the first and second voltage levels listed in the above examples are only for illustrative purposes, and it is acceptable as long as the first and second voltage levels are different; secondly, the power supply voltage in this scheme is alternating current, which is converted to direct current after conversion.

[0065] Combination Figure 1 See Figure 2 The diagram shown is a structural schematic of a power supply module in one embodiment of the present invention. Figure 2 As shown, the power supply module U1 may include:

[0066] Power supply BAT, used to provide the power supply voltage;

[0067] The gating unit U11 is coupled to the power supply BAT, the DC blocking module U2, and the switch module U3, respectively. The input terminal of the gating unit U11 is used to receive the enable signal. When the enable signal EN is at the first level, it selects the path between the power supply BAT and the DC blocking module U2, and selects the path between the power supply BAT and the switch module U3. When the enable signal EN is at the second level, it disconnects the path between the power supply BAT and the DC blocking module U2, and disconnects the path between the power supply BAT and the switch module U3.

[0068] In some embodiments, the power supply BAT can be any device or circuit capable of supplying power.

[0069] In some embodiments, when the enable signal EN is at the first level, the gating unit U11 is activated, allowing the power supply BAT to supply power to the back-end circuit or electrical device. When the enable signal EN is at the second level, the gating unit U11 is deactivated, thus breaking the path between the power supply BAT and the back-end circuit or electrical device, preventing the power supply voltage from being received.

[0070] In other words, by configuring the state of the enable signal EN, the on / off state between the power supply BAT and the DC blocking module U2, as well as between the power supply BAT and the switch module U3, can be changed, thereby controlling the working process of the electrical equipment.

[0071] In some embodiments, the gating module U11 may include a first resistor R1 and a first transistor M1. The first end of the first resistor R1 is adapted to receive the enable signal EN, and the second end of the first resistor R1 is connected to the control terminal of the first transistor M1. The first end of the first transistor M1 is coupled to the power supply BAT, the first ground terminal DC_GND, the DC blocking module U2 and the switching module U3 respectively, and the second end of the first transistor M1 is coupled to the second ground terminal A_GND.

[0072] The first resistor R1 serves to limit the current in order to prevent damage to the first transistor M1 if the voltage corresponding to the enable signal EN is too high.

[0073] When the enable signal EN has a first level, the first transistor M1 is turned on, thereby directly connecting the first ground terminal DC_GND and the second ground terminal A_GND. At this time, the power supply BAT can supply power to the load. When the enable signal EN has a second level, the first transistor M1 is turned off, and the power supply BAT cannot supply power to the load.

[0074] It should be noted that, firstly, Figure 2 The diagram also shows the three pins of the DC socket. Pin 1 is connected to the power supply BAT, used to output the power supply voltage DC1; pins 2 and 3 are connected to the first ground terminal DC_GND. Secondly, the control terminal of the first transistor M1 can refer to the gate of the first transistor M1, the first terminal of the first transistor M1 can refer to the drain of the first transistor M1, and the second terminal of the first transistor M1 can refer to the source of the first transistor M1. Thirdly... Figure 2 The first transistor M1 is used as an example for illustration. In some other embodiments, it can also be other switching devices, such as transistors.

[0075] In some embodiments, such as Figure 2 As shown, the enable signal EN is a square wave signal with a high duty cycle (as a non-limiting example, the duty cycle of the square wave signal is 97%), which can continuously supply power to the load.

[0076] In some other embodiments, the enable signal may also be other types of signals with a duty cycle.

[0077] In some embodiments, the enable signal can be obtained from the processor or input from external circuitry.

[0078] Combination Figure 1 and Figure 2 See Figure 3 The diagram shown is a schematic representation of a power supply circuit in one embodiment of the present invention. Figure 3 As shown, the DC blocking module U2 may include: a tactile switch K1 and a DC blocking capacitor C1, wherein: the first end of the tactile switch K1 is adapted to input a trigger signal, the second end of the tactile switch K1 is connected to the power supply module U1 (e.g., power supply BAT), the third end of the tactile switch K1 is connected to the first end of the DC blocking capacitor C1, and the second end of the DC blocking capacitor C1 is connected to the switch module U3.

[0079] In some embodiments, when the enable signal EN has a first level and the tactile switch K1 is triggered, the path between the power supply BAT and the DC blocking capacitor C1 is selected, so that the DC blocking capacitor C1 can filter out the DC component in the power supply voltage DC1 and output the DC blocking voltage to the switching module U3, and the switching module U3 can operate.

[0080] When no trigger signal is received, the tactile switch K1 automatically switches from the on state to the off state, thereby breaking the path between the power supply BAT and the DC blocking capacitor C1, and thus failing to provide DC blocking voltage to the switch module U3.

[0081] In other words, by using the tactile switch K1 and the DC blocking capacitor C1, on the one hand, the DC component in the power supply voltage is isolated; on the other hand, the path from the power supply BAT to the switch module U3 through the DC blocking capacitor C1 is disconnected, so that pure DC power cannot supply power to the power supply device, and only the power supply equipment and electrical equipment with matching relationship can work normally.

[0082] In some embodiments, the DC blocking voltage can also serve as a switching signal K_s, which is used to adjust the gear of the first type of load.

[0083] More specifically, the tactile switch K1 can function as a control button. When the tactile switch K1 is pressed, the brightness is increased by one level. Pressing it again increases the brightness by another level, thus enabling multi-level adjustment. In one specific embodiment, the first type of load can be an LED to achieve the brightness adjustment operation.

[0084] In some embodiments, the DC blocking voltage can also be used as a control signal D_s, which is used to select or cut off the path between the output and input terminals of the power supply circuit.

[0085] In one specific embodiment, the control signal D_s can be output to the control unit, and the control unit responds to the control signal D_s to realize the power supply operation of the load.

[0086] More specifically, when the tactile switch K1 is pressed, the SHUT_DOWN pin of the control unit is pulled low, which turns off the first transistor Q1 and cuts off the power supply path; when the tactile switch K1 is pressed again, the SHUT_DOWN pin of the control unit is pulled high, which turns on the first transistor Q1 and restores the power supply path.

[0087] In some embodiments, the switching module U3 may include: a switching unit, coupled to the DC blocking module U3 and the charging / discharging module U4 respectively, adapted to be in a selected state and output a first voltage based on the DC blocking voltage and the power supply voltage when the DC blocking module U3 is triggered; and to be in a selected state and output a second voltage based on the freewheeling voltage when the DC blocking module U3 is not triggered; and a holding unit, coupled to the switching unit and the power supply module U1 respectively, adapted to be in a selected state in response to the first voltage or the second voltage.

[0088] In other words, when the DC blocking module U3 is triggered, the DC blocking voltage output by the DC blocking capacitor C1 causes the switching unit to conduct and outputs the first voltage to the holding unit, which can be in the conducting state; when the DC blocking module U3 is not triggered, the freewheeling voltage output by the charging and discharging module U4 causes the switching unit to conduct and outputs the second voltage to the holding unit, which can be in the conducting state.

[0089] That is, at any time, the holding unit can be kept in the conducting state, thereby opening the path between the charging and discharging module U1 and the output terminal OUT.

[0090] In some embodiments, the switching unit includes a first transistor Q1, the base of the first transistor Q1 is coupled to the DC blocking module U2 (e.g., the second end of the DC blocking capacitor C1) and the charging / discharging module U4 respectively, the emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is coupled to the holding unit.

[0091] Specifically, when a DC blocking voltage or a freewheeling voltage is received, the first transistor Q1 turns on, thereby turning on the holding unit.

[0092] In some embodiments, the holding unit may include a second transistor M2, the control terminal of the second transistor M2 being coupled to the switching unit (e.g., the collector of the first transistor Q1), the first terminal of the second transistor M2 being coupled to the power supply module U1, and the third terminal of the second transistor M2 being coupled to the output terminal OUT.

[0093] Specifically, when a DC blocking voltage or a freewheeling voltage is received, the first transistor Q1 turns on, and the control terminal of the second transistor M2 receives the first voltage or the second voltage, thereby turning on the second transistor M2.

[0094] In some embodiments, the power supply circuit may further include: a first current-limiting resistor R2, disposed between the switching unit and the DC blocking module U2.

[0095] Specifically, the first end of the first current-limiting resistor R2 is connected to the second end of the DC blocking capacitor C1, and the second end of the first current-limiting resistor R2 is connected to the base of the first transistor Q1.

[0096] The second current-limiting resistor R3 is disposed between the switching unit and the holding unit.

[0097] Specifically, the first end of the second current-limiting resistor R3 is connected to the collector of the first transistor Q1, and the second end of the second current-limiting resistor R3 is connected to the control terminal of the second transistor M2.

[0098] The second resistor R4 has its first end disposed between the switching unit and the power supply module U1, and its second end coupled to the switching unit.

[0099] Specifically, the first end of the second resistor R4 is connected to the first end of the power supply module U1 and the second transistor M2, respectively, and the second end of the second resistor R4 is connected to the control terminal of the second transistor M2. In this way, in the initial state, the voltage across the second resistor R4 is the same, which allows the second transistor M2 to be in the off state.

[0100] In some embodiments, the output terminal OUT includes a first output terminal OUT1 and a second output terminal OUT2, and the voltage types of the first output terminal OUT1 and the second output terminal OUT2 are different.

[0101] In some embodiments, the voltage type of the first output terminal OUT1 is AC voltage, while the voltage type of the second output terminal OUT2 is DC voltage.

[0102] Accordingly, the charging and discharging module U4 may include: a rectifier unit, a charging and discharging unit, and a freewheeling unit, wherein: the rectifier unit is coupled between the first output terminal OUT1 and the second output terminal OUT2, and is coupled to the charging and discharging unit, for converting the type of power supply voltage;

[0103] The charging and discharging unit is coupled to the second output terminal OUT2 and is used to store the converted electrical energy of the second output terminal OUT2 when the DC blocking module U2 is triggered; and to release the stored electrical energy to generate the freewheeling voltage when the DC blocking module U2 is not triggered; the freewheeling unit is coupled to the first output terminal OUT1, the charging and discharging unit and the switching module U3 respectively, and is adapted to be in a disconnected state based on the voltage corresponding to the first output terminal OUT1 when the DC blocking module U2 is triggered; and to be in a conducting state based on the freewheeling voltage and the voltage corresponding to the first output terminal OUT1 when the DC blocking module U2 is not triggered, so as to select the path between the charging and discharging unit and the switching module U3.

[0104] Specifically, when the DC blocking module U2 is triggered and the switching module U3 is in the selected state, the path between the power supply module U1 and the first output terminal OUT1 and the second output terminal OUT2 is selected, so that the first output terminal OUT1 and the second output terminal OUT2 are both at high level. At this time, the freewheeling unit is in the disconnected state and the charging and discharging unit is in the energy storage state.

[0105] When the DC blocking module U2 is not triggered, at this instant, the switch module U3 is in the off state, and the first output terminal OUT1 and the second output terminal OUT2 are both at low level. At this time, the charging and discharging unit discharges, and the freewheeling unit is in the conducting state. In this way, the path between the charging and discharging unit and the switch module U1 is selected, so under the action of the freewheeling voltage, the switch module U1 is turned on, and the first output terminal OUT1 and the second output terminal OUT2 are both at high level.

[0106] The cycle repeats, providing power voltage to electrical equipment.

[0107] In some embodiments, the rectifier unit includes a rectifier diode D1, the first end of which is coupled to the switch module U3, and the second end of which is coupled to the charging and discharging unit.

[0108] Among them, the rectifier diode D1 plays a unidirectional conductive role, so that the power supply voltage of the positive half cycle is output to the second output terminal OUT2.

[0109] Specifically, the first terminal of rectifier diode D1 is connected to the second terminal of the second transistor M2, and the second terminal of rectifier diode D1 is connected to the second output terminal OUT2.

[0110] In some embodiments, the charging and discharging unit may include a first capacitor C2 and / or a second capacitor C3, wherein the first terminal of the first capacitor C2 is coupled to the first terminal of the second capacitor C3 and the second output terminal OUT2, respectively; and the second terminals of the first capacitor C2 and the second capacitor C3 are grounded.

[0111] In other words, when the second output terminal OUT2 is high, the first capacitor C2 and the second capacitor C3 perform energy storage operation, and when the second output terminal OUT2 is low, the first capacitor C2 and the second capacitor C3 perform energy release operation.

[0112] In some embodiments, the first capacitor C2 can also serve as a filter to make the DC output of the second output terminal OUT2 more stable, thereby improving the stability of the electrical equipment or back-end circuit.

[0113] In some embodiments, the freewheeling unit may include: a second transistor Q2, the base of the second transistor Q2 being coupled to the first output terminal OUT1, the emitter of the second transistor Q2 being coupled to the charging and discharging unit (e.g., the first terminal of the first capacitor C2), and the collector of the second transistor Q2 being coupled to the switching module U1 (e.g., the base of the first transistor Q1).

[0114] Specifically, when the first output terminal OUT1 is high, the emitter voltage of the second transistor Q2 is less than the base voltage, and the second transistor Q2 is in the off state. At this time, the first capacitor C2 performs energy storage operation. When the first output terminal OUT1 is low, the emitter voltage of the second transistor Q2 is greater than the base voltage, and the second transistor Q2 is in the on state. At this time, the first capacitor C2 performs energy release operation to provide freewheeling voltage for the first transistor Q1.

[0115] In some embodiments, the power supply circuit may further include a third current-limiting resistor R5, disposed between the freewheeling unit and the switching module U3.

[0116] Specifically, the first end of the third current-limiting resistor R5 is connected to the collector of the second transistor Q2, and the second end of the third current-limiting resistor R4 is connected to the base of the first transistor Q1.

[0117] The fourth current-limiting resistor R6 is located between the freewheeling unit and the first output terminal OUT1.

[0118] Specifically, the first end of the fourth current-limiting resistor R6 is connected to the base of the second transistor Q2, and the fourth current-limiting resistor R6 is connected to the first output terminal OUT1.

[0119] The third capacitor C4 has its first terminal located between the third current-limiting resistor R5 and the freewheeling unit (e.g., the collector of the second transistor Q2), and its second terminal grounded.

[0120] The third resistor R7 has its first end located between the switch module U1 and the output terminal OUT, and its second end grounded.

[0121] Among them, the third resistor R7 acts as a load.

[0122] To better understand and explain the principle of the power supply circuit in this utility model, through Figures 1 to 3 Please provide an explanation.

[0123] When the enable signal EN is at the first level, the first transistor M1 is turned on, thereby outputting the power supply voltage DC1 to the tactile switch K1.

[0124] When the tactile switch K1 is triggered, the DC blocking capacitor C1 can filter out the DC component in the power supply voltage DC1, thereby outputting the DC blocking capacitor to the first current limiting resistor R2. The first transistor Q1 is turned on, outputting the first voltage to the control terminal of the second transistor M2, thereby turning on the second transistor M2. The power supply BAT provides voltage for DC power through the rectification effect of the second transistor M2 and the rectifier diode D1, and at the same time, the first capacitor C2 performs energy storage operation.

[0125] Since the tactile switch K1 will disconnect when pressed, the base voltage of the first transistor Q1 cannot be maintained. As a result, both the first transistor Q1 and the second transistor M2 will disconnect, and both the first output terminal OUT1 and the second output terminal OUT2 will be at a low level. At this time, the first capacitor C2 will release energy, the second transistor Q2 will turn on, and the base of the first transistor Q1 will receive a high voltage again. Both the first transistor Q1 and the second transistor M2 will then turn on, thus achieving continuous power supply.

[0126] It should be noted that the above description describes multiple embodiments of the present invention. The optional methods described in each embodiment can be combined and cross-referenced without conflict, thereby extending to a variety of possible embodiments. These can all be considered as embodiments of the present invention.

[0127] It should be noted that the term "an embodiment" or "embodiment" in this utility model refers to a specific feature, structure, or characteristic that can be included in at least one implementation of this utility model. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with terms such as "first," "second," etc., may explicitly or implicitly include one or more of that feature. Moreover, terms such as "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or indicate importance. It is understood that such terms can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in a sequence other than that shown in the illustrations or description.

[0128] While the embodiments of this utility model have been disclosed above, this utility model is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this utility model; therefore, the scope of protection of this utility model should be determined by the scope defined in the claims.

Claims

1. A power supply circuit, characterized in that, include: The power supply module has an input terminal for receiving an enable signal, and when the enable signal is at a first level, the power supply module is in a selected state and outputs a power supply voltage. And when the enable signal is at the second level, the power supply module is in the off state; A DC blocking module is coupled to the power supply module. The DC blocking module is in a triggered state and generates a DC blocking voltage based on the power supply voltage. A switching module, coupled to the DC blocking module and the power supply module respectively, is used to select the path between the power supply module and the output terminal in response to the DC blocking voltage and the power supply voltage; And for responding to the freewheeling voltage, selecting the path between the power supply module and the output terminal; A charging and discharging module is coupled to the switching module and the output terminal respectively, and is used to convert and store the electrical energy at the output terminal when the DC blocking module is triggered. And when the DC blocking module is not triggered, the freewheeling voltage is provided to the switching module; The output terminal includes a first output terminal and a second output terminal, and the voltage types of the first output terminal and the second output terminal are different. The charging and discharging module includes a rectifier unit, a charging and discharging unit, and a freewheeling unit, wherein: the rectifier unit is coupled between a first output terminal and a second output terminal, and is also coupled to the charging and discharging unit, for converting the type of power supply voltage; the charging and discharging unit is coupled to the second output terminal, for storing the converted electrical energy at the second output terminal when the DC blocking module is triggered; and for releasing the stored electrical energy to generate the freewheeling voltage when the DC blocking module is not triggered; the freewheeling unit is coupled to the first output terminal, the charging and discharging unit, and the switching module, respectively, and is adapted to be in a disconnected state based on the voltage corresponding to the first output terminal when the DC blocking module is triggered; and to be in a conducting state based on the freewheeling voltage and the voltage corresponding to the first output terminal when the DC blocking module is not triggered, so as to select the path between the charging and discharging unit and the switching module.

2. The power supply circuit according to claim 1, characterized in that, The power supply module includes: Power supply, used to provide the power supply voltage; A gating unit is coupled to the power supply, the DC blocking module, and the switching module respectively. The input terminal of the gating unit is used to receive the enable signal, and when the enable signal is at the first level, it selects the path between the power supply and the DC blocking module, and selects the path between the power supply and the switching module; and when the enable signal is at the second level, it disconnects the path between the power supply and the DC blocking module, and disconnects the path between the power supply and the switching module.

3. The power supply circuit according to claim 2, characterized in that, Meet at least one or more of the following conditions: The gating module includes a first resistor and a first transistor. A first end of the first resistor is adapted to receive the enable signal, and a second end of the first resistor is connected to the control terminal of the first transistor. A first end of the first transistor is coupled to the power supply, a first ground terminal, the DC blocking module, and a switching module, respectively, and a second end of the first transistor is coupled to a second ground terminal. The enable signal is a square wave signal.

4. The power supply circuit according to claim 1, characterized in that, The DC blocking module includes a tactile switch and a DC blocking capacitor, wherein: the first end of the tactile switch is adapted to input a trigger signal, the second end of the tactile switch is connected to the power supply module, the third end of the tactile switch is connected to the first end of the DC blocking capacitor, and the second end of the DC blocking capacitor is connected to the switch module.

5. The power supply circuit according to claim 1, characterized in that, The switching module includes: A switching unit, coupled to the DC blocking module and the charging / discharging module respectively, is adapted to be in a selected state and output a first voltage when the DC blocking module is triggered, based on the DC blocking voltage and the power supply voltage; and to be in a selected state and output a second voltage when the DC blocking module is not triggered, based on the freewheeling voltage. The holding unit is coupled to the switching unit and the power supply module respectively, and is adapted to be in a selected state in response to the first voltage or the second voltage.

6. The power supply circuit according to claim 5, characterized in that, Meet at least one or more of the following conditions: The switching unit includes a first transistor, the base of which is coupled to the DC blocking module and the charging / discharging module respectively, the emitter of which is grounded, and the collector of which is coupled to the holding unit. The holding unit includes a second transistor, the control terminal of the second transistor is coupled to the switching unit, the first terminal of the second transistor is coupled to the power supply module, and the third terminal of the second transistor is coupled to the output terminal. A first current-limiting resistor is disposed between the switching unit and the DC blocking module; A second current-limiting resistor is disposed between the switching unit and the holding unit; The second resistor has its first end disposed between the switching unit and the power supply module, and its second end coupled to the switching unit.

7. The power supply circuit according to claim 1, characterized in that, The rectifier unit includes: a rectifier diode, the first end of which is coupled to the switching module, and the second end of which is coupled to the charging and discharging unit; The charging and discharging unit includes a first capacitor and / or a second capacitor, wherein a first terminal of the first capacitor is coupled to a first terminal of the second capacitor and a second output terminal, respectively; and the second terminals of the first capacitor and the second capacitor are grounded. The freewheeling unit includes: a second transistor, the base of which is coupled to the first output terminal, the emitter of which is coupled to the charging and discharging unit, and the collector of which is coupled to the switching module.

8. The power supply circuit according to claim 1 or 7, characterized in that, The charging / discharging module also satisfies at least one or more of the following: A third current-limiting resistor is disposed between the freewheeling unit and the switching module; A fourth current-limiting resistor is disposed between the freewheeling unit and the first output terminal. The third capacitor has its first terminal disposed between the third current-limiting resistor and the freewheeling unit, and its second terminal grounded.

9. The power supply circuit according to claim 1, characterized in that, Meet at least one or more of the following conditions: The DC blocking voltage serves as a switching signal, which is used to adjust the gear of the first type of load. The DC blocking voltage serves as a control signal, which is used to select or cut off the path between the output and input terminals of the power supply circuit. The third resistor has its first end positioned between the switch module and the output terminal, and its second end grounded.

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