CN218733349U - Battery switching circuit and switching power supply - Google Patents
Battery switching circuit and switching power supply Download PDFInfo
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- CN218733349U CN218733349U CN202222913342.5U CN202222913342U CN218733349U CN 218733349 U CN218733349 U CN 218733349U CN 202222913342 U CN202222913342 U CN 202222913342U CN 218733349 U CN218733349 U CN 218733349U
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Abstract
The embodiment of the utility model discloses battery switching circuit and switching power supply. The specific implementation scheme is as follows: the driving charging module comprises a resistance unit and a capacitance unit, the resistance unit and the capacitance unit are connected in parallel, and the capacitance unit is used for transmitting driving power supply voltage to the control end of the discharging field effect transistor after the battery is activated. The embodiment of the utility model provides a when making the heavy load of battery high-pressure area or taking great electric capacity switching, discharge field effect transistor is not fragile, has solved traditional FTU or DTU at the during operation, if the mechanism work is half or the mechanism card shell, the reactivation battery this moment, and the battery is electrified to take the heavy load to can be the discharge field effect transistor damage problem in the circuit, has promoted the stability and the reliability of circuit.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a battery switching circuit and switching power supply.
Background
With the increasing and rapid increase of the industrial power market demand, the application of the switching power supply is more and more extensive, the switching power supply is generally used in the industries of machinery, electric power and the like in China, and meanwhile, the industrial power demand of the industries of machine tools, heavy machinery, electric power, rail transit and the like is also sharply increased. When the switching power supply is applied to the switching of the high-voltage load of the battery, the battery switching circuit of the conventional switching power supply has the defect that a discharging field effect transistor is easy to damage.
The specific reason is that when the battery is in heavy load or is switched by a large capacitor, large current can be released instantly due to small internal resistance of the battery. At the moment, the discharge field effect transistor in the battery switching circuit is in an amplification region, and because the internal resistance of the discharge field effect transistor is small, if the current flowing through the internal resistance is large, the voltage drop of the internal resistance of the discharge field effect transistor is increased, so the loss of the discharge field effect transistor is increased. If the switching time is too long, namely the retention time in the amplification region of the discharging field effect transistor is too long, the accumulated heat is enough to damage the discharging field effect transistor.
Therefore, the existing battery switching circuit has the problem that the discharging field effect transistor is easy to damage.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a battery switching circuit and switching power supply for when solving when switching power supply is used for the switching of battery high pressure area load, switching power supply's battery switching circuit has the fragile problem of field effect transistor that discharges, has promoted the stability and the reliability of circuit.
In a first aspect, an embodiment of the present invention provides a battery switching circuit, include:
the discharging field effect transistor is connected between the battery and the grounding end in series; the discharge field effect transistor further comprises a control terminal;
the driving switch module and the driving charging module are connected in series between the control end of the discharging field effect transistor and the driving power end;
the driving charging module comprises a resistance unit and a capacitance unit; the resistance unit and the capacitance unit are connected in parallel; the capacitor unit is used for transmitting the driving power to the control end of the discharging field effect transistor after the battery is activated.
Optionally, the resistance unit includes: the first end of the driving resistor is electrically connected with the driving switch module, and the second end of the driving resistor is electrically connected with the control end of the discharge field effect transistor; the capacitor unit includes: and the first end of the driving capacitor is electrically connected with the driving switch module, and the second end of the driving capacitor is electrically connected with the control end of the discharging field effect transistor.
Further, the resistance value of the driving resistor is larger than a preset value.
Optionally, the discharge field effect transistor is an MOS transistor; the source electrode of the MOS tube is electrically connected with the cathode of the battery, the drain electrode of the MOS tube is electrically connected with the grounding end, and the grid electrode of the MOS tube is used as the control end of the discharge field effect transistor.
Optionally, the battery switching circuit further includes: a decoupling resistance; the first end of the decoupling resistor is electrically connected with the grid electrode of the MOS tube, and the second end of the decoupling resistor is electrically connected with the source electrode of the MOS tube.
Optionally, the battery switching circuit further includes: and the anode of the driving voltage stabilizing diode is electrically connected with the source electrode of the MOS tube, and the cathode of the driving voltage stabilizing diode is electrically connected with the grid electrode of the MOS tube.
Optionally, the driving switch module of the battery switching circuit includes: a key activation button and a hold optocoupler; the key activation button is connected with the keeping optocoupler in parallel; the control end of the keeping optocoupler is electrically connected with the battery, and the keeping optocoupler is used for voltage transmission of the battery, so that the key activation button is always in a power-on state.
Optionally, the battery switching circuit includes: a first unidirectional conducting diode and a second unidirectional conducting diode;
the anode of the first unidirectional conduction diode is electrically connected with the anode of the battery, and the cathode of the first unidirectional conduction diode is electrically connected with the load;
the anode of the second one-way conduction diode is electrically connected with the cathode of the first one-way conduction diode, and the cathode of the second one-way conduction diode is electrically connected with the driving switch module.
In a second aspect, the embodiment of the present invention further provides a switching power supply, including: the battery switching circuit comprises a battery positive electrode access end, a battery negative electrode access end, a load access end, a grounding end and a battery switching circuit;
the positive electrode access end of the battery is connected with the positive electrode of the battery, the negative electrode access end of the battery is connected with the negative electrode of the battery, the load access end is connected with the load, and the grounding end is grounded; the positive electrode of the battery is reused as a driving power supply.
The utility model discloses technical scheme charges the module and includes resistance unit and electric capacity unit through setting up the drive, resistance unit and electric capacity unit parallel connection, and electric capacity unit is used for transmitting drive power supply voltage to discharge field effect transistor's control end behind the activation battery. Because the capacitor unit is in the state of not fully charged at the moment when the key activation button is just pressed down for power on, the capacitor unit is equivalent to a short circuit in a battery switching circuit, larger current directly flows through the resistor unit, and the equivalent impedance clamped between the two ends of the capacitor unit and the resistor unit is extremely low according to the ohm law, so that the charging process of the power supply voltage to the control end of the discharging field effect transistor is extremely short, and the discharging field effect transistor can be driven quickly. Compared with the prior art, the time of the discharging field effect transistor in the amplifying region is extremely short, and the loss is reduced, so that the heat generated by the discharging field effect transistor is reduced, the damage of the discharging field effect transistor is favorably avoided, and the stability and the reliability of the circuit are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery switching circuit provided by an embodiment of the present invention.
Fig. 2 is a circuit diagram of a battery switching circuit provided by an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the inventive arrangements, exemplary embodiments of the present application will be described below with reference to the accompanying drawings, in which various details of the embodiments of the present application are included to assist understanding, and which should be considered as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.
Fig. 1 is a schematic structural diagram of a battery switching circuit provided by an embodiment of the present invention. The embodiment of the utility model provides an applicable FTU or DTU in tradition at the during operation, if the mechanism work to half or mechanism card shell, when needing the reactivation battery, the battery high-voltage belt heavy load perhaps takes the condition of great electric capacity switching.
Referring to fig. 1, an embodiment of the present invention provides a battery switching circuit, including:
a discharging field effect transistor 310, a driving switch module 110 and a driving charge module 210. Wherein, the discharging fet 310 is connected in series between the battery and the ground OGND; the discharge field effect transistor 310 further includes a control terminal; the driving switch module 110 and the driving charge module 210 are connected in series between the control terminal of the discharging field effect transistor 310 and the driving power terminal; the driving charging module 210 includes a resistor unit 211 and a capacitor unit 212; the resistance unit 211 and the capacitance unit 212 are connected in parallel; the capacitor unit 211 serves to transmit a driving power voltage to the control terminal of the discharging field effect transistor 310 after the battery is activated.
The discharging field effect transistor 310 may be specifically understood as a solid semiconductor device, which is regarded as a variable current switch capable of controlling an output current based on an input voltage, and has various functions such as detection, rectification, amplification, switching, voltage stabilization, signal modulation, and the like. The drive power supply terminal is understood in particular to be the power supply connection terminal which supplies the voltage to the discharging field effect transistor 310.
Referring to fig. 1, the connection relationship between the battery switching circuit and the battery and the load is, for example, that the positive terminal B + of the battery is electrically connected to the driving power terminal of the battery switching circuit, so that the battery can be used as the driving power source to supply power to the control terminal of the discharging field effect transistor. Meanwhile, the positive terminal B + of the battery is electrically connected to the first terminal VO + of the load, the discharging fet 310 is connected in series between the negative terminal B-of the battery and the ground terminal OGND, and the second terminal of the load is electrically connected to the ground terminal OGND.
The FTU in this embodiment can be specifically understood as a new generation of feeder automation remote terminal device that integrates functions of telemetry, remote signaling, remote control, protection, and communication, and has the advantages of high stability, high reliability, good real-time performance, wide applicable environment, and powerful functions, by using advanced DSP digital signal processing technology, multi-CPU integration technology, and high-speed industrial network communication technology.
A DTU is to be understood as a switching station terminal; the device is generally installed at a conventional switching station (station), an outdoor small-sized switching station, a ring main unit, a small-sized substation, a box-type substation and the like, and is used for completing the acquisition and calculation of position signals, voltage, current, active power, reactive power, power factors, electric energy and other data of the switch equipment, performing switching-on and switching-off operation on the switch, and realizing fault identification and isolation of a feeder switch and recovery power supply of a non-fault section.
When the mechanism works to a half or the mechanism is clamped, the mechanism can be concretely understood as the failure of closing rejection, opening rejection and misoperation of the spring operating mechanism; the spring operating mechanism can be specifically understood as a device which is used for switching on and off, controlling protection, debugging and measuring in a high-voltage line and is used as a switching action; the spring operating mechanism can be installed in an outdoor high-voltage vacuum circuit breaker, and the spring operating mechanism mainly plays a role in switching on and switching off in the vacuum circuit breaker.
The working principle of the battery switching circuit is as follows: when the key activation button KW1 is pressed, the battery charges the discharging fet 310 to its on-voltage by driving the charging module 210, and when the capacitor unit 212 of the driving charging module 210 is fully charged, the resistor unit 211 provides a driving current, and since the capacitor unit 212 is in an uncharged state when the key activation button KW1 is just pressed and energized, the capacitor unit 212 is in a short circuit in the battery switching circuit, and a large current directly flows through the resistor unit 211, the equivalent impedance between the capacitor unit 212 and the resistor unit 211 is extremely low, so that the charging process of the power supply voltage to the control terminal of the discharging fet 310 is extremely short, and the discharging fet 310 can be driven quickly. The process that the discharging field effect transistor 310 drives too slowly when the battery voltage is too high is effectively avoided.
The utility model discloses technical scheme charges the module and includes resistance unit and electric capacity unit through setting up the drive, resistance unit and electric capacity unit parallel connection, and electric capacity unit is used for transmitting drive power supply voltage to discharge field effect transistor's control end behind the activation battery. Because the capacitor unit is in the state of not fully charged at the moment when the key activation button is just pressed down for electrifying, the capacitor unit is equivalent to a short circuit in a battery switching circuit, larger current directly flows through the resistor unit, and the equivalent impedance clamped between the capacitor unit and the resistor unit is extremely low according to the ohm law, so that the charging process of the power supply voltage to the control end of the discharging field effect transistor is extremely short, and the discharging field effect transistor can be driven quickly. Compared with the prior art, the time of the discharging field effect transistor in the amplifying region is extremely short, and the loss is reduced, so that the heat generated by the discharging field effect transistor is reduced, the damage of the discharging field effect transistor is favorably avoided, and the stability and the reliability of the circuit are improved.
Fig. 2 is a circuit diagram of a battery switching circuit according to an embodiment of the present invention. Referring to fig. 2, on the basis of the above embodiments, optionally, the resistance unit 211 includes: a first end of the driving resistor R1 is electrically connected to the driving switch module 110, and a second end of the driving resistor R1 is electrically connected to the control end G of the discharging field effect transistor 310.
The capacitance unit 212 includes: and a first end of the driving capacitor C1 is electrically connected to the driving switch module 110, and a second end of the driving capacitor C1 is electrically connected to the control end G of the discharging field effect transistor 310.
Illustratively, during the operation of the battery switching circuit, the driving resistor R1 is used to provide a driving current to the discharging fet 310, and the driving capacitor C1 is used to transmit a driving power voltage to the control terminal of the discharging fet 310 after the battery is activated. When the key activation button KW1 is just pressed to be powered on, the capacitor unit 212 drives the capacitor C1 to be in a state of not fully charged at this time, which is equivalent to a short circuit in a battery switching circuit, and a large current directly flows through the driving resistor R1, so that the equivalent impedance between the two ends of the driving capacitor C1 and the driving resistor R1 is extremely low, and thus, the charging process of the power supply voltage to the control end of the discharging field effect transistor 310 is extremely short, and the discharging field effect transistor 310 can be driven quickly. The driving resistor R1 and the driving capacitor C1 are connected in parallel and then connected in series between the driving switch module 110 and the control terminal G of the discharging fet 310.
It should be noted that fig. 2 exemplarily shows that the resistor unit 211 includes a driving resistor R1, and the capacitor unit 212 includes a driving capacitor C1, which is not a limitation of the present invention. In other embodiments, at least two resistor series-parallel connections may be provided in the resistor unit 211, or at least two capacitor series-parallel connections may be provided in the capacitor unit 212, as required.
Further, the resistance value of the driving resistor R1 is greater than a preset value.
Illustratively, during the operation of the battery switching circuit, the driving resistor R1 is used to provide a driving current to the discharging fet 310, and the driving capacitor C1 is used to transmit a driving power voltage to the control terminal of the discharging fet Q1 after the battery is activated. When the button activation KW1 is just pressed to be powered on, the driving capacitor C1 is in an unfilled state at the moment, a short circuit is formed in a battery switching circuit, the current flowing through the driving resistor R1 is large at the moment, after the driving capacitor C1 is fully charged, the driving resistor R1 provides driving current for the discharging field effect transistor 310, the current flowing through the driving resistor is small at the moment, and therefore the driving power consumption of the discharging field effect transistor 310 can be reduced by selecting large resistor.
Compared with the prior art, the embodiment of the utility model, the time that discharge field effect transistor is in the region of amplification is extremely short, and discharge field effect transistor can drive fast, and the drive consumption also reduces thereupon, and then has reduced the heat that discharge field effect transistor produced, has avoided discharge field effect transistor's damage, has promoted the stability and the reliability of circuit.
Specifically, the discharging field effect transistor 310 is a MOS transistor Q1; the source S of the MOS transistor Q1 is electrically connected to the negative electrode of the battery, the drain D of the MOS transistor Q1 is electrically connected to the ground OGND, and the gate G of the MOS transistor serves as the control terminal of the discharging field effect transistor 310.
Further, the method also comprises the following steps: a decoupling resistance R2; the first end of the decoupling resistor R2 is electrically connected to the gate G of the MOS transistor Q1, and the second end of the decoupling resistor R2 is electrically connected to the source S of the MOS transistor Q1.
The embodiment of the utility model provides a decoupling resistance R2 can prevent effectively that the control end of discharge field effect transistor 310 from the influence that the electric current impact that forms when the electric current size changes normally discharges the production to the battery in battery switching circuit, and then has promoted the stability and the reliability of circuit.
Further, the method also comprises the following steps: and the anode of the driving voltage-stabilizing diode DZ1 is electrically connected with the source electrode S of the MOS tube Q1, and the cathode of the driving voltage-stabilizing diode DZ1 is electrically connected with the grid electrode G of the MOS tube Q1.
The embodiment of the utility model provides a zener diode DZ1 can prevent effectively that discharge field effect transistor 310's control end when the electric current size changes in battery switching circuit, and the voltage fluctuation of formation makes the voltage of discharge field effect transistor 310 control end can keep constant voltage to the influence that the battery normally discharged and produced, and then has promoted the stability and the reliability of circuit.
Optionally, the driving switch module 110 includes: a key activation button KW1 and a keeping optocoupler PC1B; the key activation button KW1 is connected with the keeping optocoupler PC1B in parallel; and the control end of the optocoupler PC1B is kept to be electrically connected with the battery. Keeping the optocoupler PC1B for voltage transmission of the battery.
Illustratively, when the battery voltage keeps the optocoupler PC1B on above the battery discharge cut-off point, and when the battery voltage keeps the optocoupler PC1B off below the battery discharge cut-off point, the battery stops discharging.
Specifically, the battery discharge off-point may be specifically understood as a point that controls whether the battery is discharged.
The embodiment of the utility model provides a keep opto-coupler PC1B to make button KW1 press the back, keep the button action of pressing, and then make battery switching circuit be in the on-state all the time. The stability and the reliability of the circuit are improved.
Further, the battery switching circuit further comprises: a first unidirectional conducting diode D1 and a second unidirectional conducting diode D2;
the anode of the first one-way conduction diode D1 is electrically connected with the anode B + of the battery, and the cathode of the first one-way conduction diode D1 is electrically connected with the load VO +;
the anode of the second unidirectional conducting diode D2 is electrically connected to the cathode of the first unidirectional conducting diode D1, and the cathode of the second unidirectional conducting diode D2 is electrically connected to the driving switch module 110.
The embodiment of the utility model provides a switching power supply is still provided. The switching power supply includes: battery positive pole incoming end B +, battery negative pole incoming end B-, load incoming end VO +, earthing terminal OGND and if the utility model discloses the battery switching circuit that arbitrary embodiment provided, its technical principle is similar with the effect that produces, no longer gives unnecessary details. The positive electrode access end B + of the battery is connected with the positive electrode of the battery, the negative electrode access end B-of the battery is connected with the negative electrode of the battery, the load access end VO + of the battery is connected with the load, and the grounding end OGND of the battery is grounded; the positive pole of the battery is reused as a driving power supply.
The technical scheme of the embodiment of the utility model is that the driving charging module is arranged, and comprises a resistance unit and a capacitance unit; the resistance unit comprises a driving resistor, and the capacitance unit comprises a driving capacitor; the driving resistor and the driving capacitor are connected in parallel. The driving capacitor is used for transmitting the driving power supply voltage to the control terminal of the discharging field effect transistor after the battery is activated. When the key activation button is just pressed down to be powered on, the driving capacitor is in an uncharged state, the driving capacitor is equivalent to a short circuit in a battery switching circuit, and larger current directly flows through the driving resistor, so that the equivalent impedance clamped between the driving resistor and the driving capacitor is extremely low, the charging process of the power supply voltage to the control end of the discharging field effect transistor is extremely short, and the discharging field effect transistor can be driven quickly. Compared with the prior art, the time of the discharging field effect transistor in the amplifying region is extremely short, and the loss is reduced, so that the heat generated by the discharging field effect transistor is reduced, the damage of the discharging field effect transistor is favorably avoided, and the stability and the reliability of the circuit are improved.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, may be executed sequentially, or may be executed in different orders, as long as the desired result of the technical solution of the present invention can be achieved, and the present invention is not limited thereto.
The above detailed description does not limit the scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A battery switching circuit, comprising:
a discharging field effect transistor connected in series between the battery and a ground terminal; the discharge field effect transistor further comprises a control end;
the driving switch module and the driving charging module are connected in series between the control end of the discharging field effect transistor and the driving power end;
the driving charging module comprises a resistance unit and a capacitance unit; the resistance unit and the capacitance unit are connected in parallel; the capacitor unit is used for transmitting a driving power supply to the control end of the discharge field effect transistor after the battery is activated.
2. The battery switching circuit according to claim 1, wherein the resistance unit comprises: the first end of the driving resistor is electrically connected with the driving switch module, and the second end of the driving resistor is electrically connected with the control end of the discharging field effect transistor;
the capacitance unit includes: and the first end of the driving capacitor is electrically connected with the driving switch module, and the second end of the driving capacitor is electrically connected with the control end of the discharging field effect transistor.
3. The battery switching circuit according to claim 2, wherein the resistance of the driving resistor is greater than a predetermined value.
4. The battery switching circuit according to claim 1, wherein the discharging field effect transistor is a MOS transistor; the source electrode of the MOS tube is electrically connected with the cathode of the battery, the drain electrode of the MOS tube is electrically connected with the grounding end, and the grid electrode of the MOS tube is used as the control end of the discharge field effect transistor.
5. The battery switching circuit of claim 4, further comprising: a decoupling resistance; the first end of the decoupling resistor is electrically connected with the grid electrode of the MOS tube, and the second end of the decoupling resistor is electrically connected with the source electrode of the MOS tube.
6. The battery switching circuit of claim 4, further comprising: and the anode of the driving voltage stabilizing diode is electrically connected with the source electrode of the MOS tube, and the cathode of the driving voltage stabilizing diode is electrically connected with the grid electrode of the MOS tube.
7. The battery-switched circuit of claim 1, wherein the drive switch module comprises: a key activation button and a hold optocoupler; the key activation button is connected in parallel with the holding optocoupler; the control end of the keeping optocoupler is electrically connected with the battery, and the keeping optocoupler is used for voltage transmission of the battery.
8. The battery switching circuit of claim 1, further comprising: a first unidirectional conducting diode and a second unidirectional conducting diode;
the anode of the first unidirectional conduction diode is electrically connected with the anode of the battery, and the cathode of the first unidirectional conduction diode is electrically connected with a load;
and the anode of the second unidirectional conduction diode is electrically connected with the cathode of the first unidirectional conduction diode, and the cathode of the second unidirectional conduction diode is electrically connected with the driving switch module.
9. A switching power supply, comprising: the battery switching circuit comprises a battery positive electrode access end, a battery negative electrode access end, a load access end, a grounding end and the battery switching circuit according to any one of claims 1-8;
the battery positive electrode access end is connected to the positive electrode of the battery, the battery negative electrode access end is connected to the negative electrode of the battery, the load access end is connected to a load, and the grounding end is grounded; and the positive electrode of the battery is reused as the driving power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222913342.5U CN218733349U (en) | 2022-11-02 | 2022-11-02 | Battery switching circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222913342.5U CN218733349U (en) | 2022-11-02 | 2022-11-02 | Battery switching circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218733349U true CN218733349U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222913342.5U Active CN218733349U (en) | 2022-11-02 | 2022-11-02 | Battery switching circuit and switching power supply |
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| CN (1) | CN218733349U (en) |
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- 2022-11-02 CN CN202222913342.5U patent/CN218733349U/en active Active
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