CN214956636U - Switch circuit for DC heavy current occasion and battery charging and discharging control circuit - Google Patents
Switch circuit for DC heavy current occasion and battery charging and discharging control circuit Download PDFInfo
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- CN214956636U CN214956636U CN202120792547.5U CN202120792547U CN214956636U CN 214956636 U CN214956636 U CN 214956636U CN 202120792547 U CN202120792547 U CN 202120792547U CN 214956636 U CN214956636 U CN 214956636U
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Abstract
The utility model provides a switch circuit and battery charge-discharge control circuit for direct current heavy current occasion. The switching circuit comprises a relay, a coil control circuit for controlling the coil of the relay to be electrified or powered off, an electronic switching tube and a first grid voltage power supply circuit; the normally open contact of the relay is connected in series in a direct current loop to be switched on or switched off, the source electrode and the drain electrode of the electronic switch tube are respectively connected with two ends of the normally open contact, the input end of the first grid voltage power supply circuit is externally connected with a first control signal, and the output end of the first grid voltage power supply circuit is connected with the grid electrode of the electronic switch tube; the input end of the coil control circuit is externally connected with a second control signal. The total resistance of the switching circuit is reduced compared with that of a single electronic switching tube, and the heat productivity is reduced; the electronic switch is connected in parallel, electric arc cannot be generated when the relay normally opens the contact switch to damage the contact, and the arc extinguishing effect is achieved; the circuit structure is simple, a complex analog control circuit is not needed, and the first grid voltage power supply circuit ensures that the electronic switching tube works reliably.
Description
Technical Field
The utility model relates to the field of switch technology, concretely relates to a switch circuit and battery charge-discharge control circuit for direct current heavy current occasion.
Background
In the DC large current occasion (the DC voltage exceeds 30V, such as the DC power supply system voltage in the power system is 110V/220V). If an electronic switch (such as MOSFET, I GBT and the like) is used for switching a direct current large current, a large amount of heat is generated when the direct current large current is introduced due to the large internal resistance of the electronic switch, and the energy loss and the heat generation are serious; if a relay switch is used for switching a large direct current, a common power relay can only cut off the direct current within 30V and cut off the direct current higher than 30V under the rated load current, and the contact of the relay is burnt out due to arc discharge. Therefore, it is important to design a switching circuit that has a small internal resistance and does not generate an arc during switching operation, which can be applied to a dc large current.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects existing in the prior art, the utility model aims to provide a switch circuit and battery charge-discharge control circuit for direct current heavy current occasion.
In order to achieve the above object of the present invention, according to a first aspect of the present invention, the present invention provides a switching circuit for a dc heavy current application, comprising a relay, a coil control circuit for controlling the coil of the relay to be powered on or off, an electronic switching tube, and a first gate voltage supply circuit; the normally open contact of the relay is connected in series in a direct current loop to be switched on or switched off, the source electrode and the drain electrode of the electronic switching tube are respectively connected with two ends of the normally open contact, the input end of the first grid voltage power supply circuit is externally connected with a first control signal, and the output end of the first grid voltage power supply circuit is connected with the grid electrode of the electronic switching tube; and the input end of the coil control circuit is externally connected with a second control signal.
The technical scheme is as follows: on one hand, the normally open contact of the relay is connected with the electronic switch tube in parallel, so that the total resistance of the switch circuit is reduced compared with that of a single electronic switch tube, and further the heat productivity is reduced; on the other hand, will when needs the utility model discloses a when the switch circuit becomes the closure state from the off-state, first control signal of inputing earlier makes the electronic switch pipe switch on, and second control signal of inputing again makes the relay coil circular telegram, and then actuation relay normally open contact is closed, and switch circuit gets into the closure state, and will when needs the utility model discloses a when the switch circuit becomes the off-state from the closure state, it makes the relay coil outage to close second control signal earlier, and the disconnection of relay normally open contact closes, closes first control signal again and makes the disconnection of electronic switch pipe, and switch circuit gets into the off-state, owing to and having electronic switch, can not produce electric arc when relay normally open contact opens or closes and let the contact damage, reaches the effect of arc extinguishing. Although the switching circuit of this application needs two external control signals, simple structure need not complicated analog control circuit, just can realize reducing the effect that generates heat and arc extinguishing, sets up bias voltage for electronic switch tube's grid through first grid voltage supply circuit simultaneously, ensures that electronic switch tube reliably works under the effect of first control signal.
The utility model discloses an in a preferred embodiment, first grid voltage supply circuit includes first resistance and second resistance, the first end of second resistance with electronic switch tube's source electrode is connected, the second end of second resistance respectively with electronic switch tube's grid and the first end of first resistance are connected, the external first control signal of second end of first resistance.
The technical scheme is as follows: bias voltage is set for the grid electrode and the source electrode of the electronic switching tube in a resistance voltage division mode, and the structure is simple and reliable.
The utility model discloses an in a preferred embodiment, coil control circuit includes triode, third resistance and fourth resistance, the external second control signal of first end of third resistance, the second end of third resistance is connected with the base of triode and the first end of fourth resistance respectively, and the second end of fourth resistance is connected with the projecting pole of triode, and the collecting electrode and the projecting pole of triode concatenate in the coil power supply loop of relay.
The technical scheme is as follows: when the second control signal is at high level, the collector and emitter of the triode are connected, the coil power supply circuit of the relay is connected with the coil and powered on, and when the second control signal is at low level, the collector and emitter of the triode are cut off, and the coil power supply circuit of the relay is disconnected with the coil and powered off. By utilizing the characteristic that the triode can be communicated with large current, a biasing circuit formed by a third resistor and a fourth resistor is arranged between the base electrode and the emitting electrode of the triode, so that the coil control circuit has the function of stably and reliably controlling the on-off of a coil power supply loop of the relay.
In a preferred embodiment of the present invention, the relay further includes a first diode, a cathode of the first diode is connected to the high potential end of the relay coil after being energized, and an anode of the first diode is connected to the low potential end of the relay coil after being energized.
The technical scheme is as follows: when the relay coil is powered off, the electric energy stored in the coil can be released through the first diode, and the safety and reliability of the circuit are improved.
In order to achieve the above object of the present invention, according to a second aspect of the present invention, the present invention provides a switching circuit for a dc heavy current application, comprising a relay, a coil control circuit for controlling the coil of the relay to be powered on or off, a first electronic switching tube and a second electronic switching tube; the normally open contact of the relay is connected in series in a direct current loop to be switched on or switched off, the source electrode of the second electronic switch tube is connected with the first end of the normally open contact, the drain electrode of the second electronic switch tube is connected with the drain electrode of the first electronic switch tube, the source electrode of the first electronic switch tube is connected with the second end of the normally open contact, the grid electrode of the first electronic switch tube is externally connected with a first control signal, and the grid electrode of the second electronic switch tube is externally connected with a third control signal.
The technical scheme is as follows: in the prior art, a parasitic diode of an electronic switching tube (such as an anode of the parasitic diode of an NMOS switching tube is connected with a source electrode, and a cathode of the parasitic diode is connected with a drain electrode) has unidirectionality, after the electronic switching tube is cut off, reverse (diode conducting direction) current can not be turned off due to the action of the parasitic diode, a switching circuit is connected with a normally open contact of a relay in parallel through two electronic switching tubes connected back to back, the current direction can be controlled independently, bidirectional current flow control can be realized, bidirectional current turn-off can be realized, bidirectional protection can be realized, and arc extinction can be realized by controlling the sequence of external control signals (a first control signal and a third control signal) of the two electronic switching tubes and control signals of a coil control circuit. In a preferred embodiment of the present invention, the power supply device further comprises a second gate voltage supply circuit and/or a third gate voltage supply circuit; the second grid voltage power supply circuit comprises a fifth resistor and a sixth resistor, wherein the first end of the fifth resistor is externally connected with a first control signal, the second end of the fifth resistor is respectively connected with the first end of the sixth resistor and the grid electrode of the first electronic switching tube, and the second end of the sixth resistor is respectively connected with the source electrode of the first electronic switching tube; the third grid voltage power supply circuit comprises a seventh resistor and an eighth resistor; the first end of the eighth resistor is externally connected with a third control signal, the second end of the eighth resistor is respectively connected with the first end of the seventh resistor and the grid electrode of the second electronic switching tube, and the second end of the seventh resistor is respectively connected with the source electrode of the second electronic switching tube.
The technical scheme is as follows: and bias voltages are respectively set for the grids of the first electronic switching tube and the second electronic switching tube through the second grid voltage power supply circuit and the third grid voltage power supply circuit, so that the reliable work of the electronic switching tubes is ensured.
In order to realize the above object, according to the utility model discloses a third aspect, the utility model provides a battery charge-discharge control circuit, include a switch circuit for direct current heavy current occasion, normally open contact's first end is connected with the negative pole of battery, normally open contact's second end is connected with ground.
The technical scheme is as follows: when charging, first electronic switch tube and second electronic switch tube are closed first, then the relay is closed, after charging is finished, after the relay is disconnected, first electronic switch tube is disconnected again, and the state of predischarge is entered, under the predischarge state, the closed second electronic switch tube and parasitic diode of first electronic switch tube form predischarge loop together, at the moment of power failure, the load (such as base station load) can not be cut off, the predischarge loop can provide electric energy for load, after power failure is confirmed and the battery is used for supplying power, first electronic switch tube and relay are closed in turn to enter into the discharging state. After the battery is discharged, the relay is disconnected firstly, then the second electronic switch tube is disconnected, the closed first electronic switch tube and the parasitic diode of the second electronic switch tube form a pre-charging loop together, the pre-charging loop enables the battery to be charged directly after the call is received, and when the battery is charged after the call is received, the second electronic switch and the relay are closed in sequence to enter a charging state. In summary, the pre-charging circuit and the pre-discharging circuit respectively aim at two states of the battery after the battery is discharged and is cut off and is charged and saturated, so that the pre-charging circuit is closed after the battery is discharged, the battery can be charged after the battery is powered on, the pre-discharging circuit is closed after the battery is charged, and the load cannot be powered off after the power failure.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a switch circuit for a dc high current situation according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a switching circuit for a dc large current application in a battery charging/discharging control circuit according to a preferred embodiment of the present invention;
fig. 3 is a schematic diagram of a parasitic diode of the electronic switching tube of fig. 2.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The utility model discloses a switch circuit for direct current heavy current occasion, in a preferred embodiment, as shown in figure 1, the switch circuit comprises a relay, a coil control circuit for controlling the coil of the relay to be electrified or cut off, an electronic switch tube and a first grid voltage supply circuit; a normally open contact K1 of the relay is connected in series in a direct current loop to be switched on or switched off, a source electrode and a drain electrode of the electronic switch tube are respectively connected with two ends of the normally open contact, an input end of the first grid voltage power supply circuit is externally connected with a first control signal, and an output end of the first grid voltage power supply circuit is connected with a grid electrode of the electronic switch tube; the input end of the coil control circuit is externally connected with a second control signal.
In the present embodiment, the electronic switch tube is preferably, but not limited to, an NMOS tube. The coil control circuit can be a commonly used triode switch circuit or a PMOS tube switch circuit or a relay switch circuit and the like.
In this embodiment, the external first control signal and the external second control signal may be output through an I/O interface of an external microprocessor, or may be obtained by configuring a single manual switch circuit. Preferably, the manual switch circuit includes a manual switch and a pull-down resistor, one end of the manual switch is connected to the power supply end, the other end of the manual switch is respectively connected to the first end and the controlled end of the pull-down resistor (such as the input end of the coil control circuit or the gate of the electronic switch tube), the second end of the pull-down resistor is grounded, when the manual switch is turned on, the controlled end obtains a high level, and when the manual switch is turned off, the controlled end obtains a low level.
In this embodiment, as shown in fig. 1, the first gate voltage supply circuit preferably includes a first resistor R1 and a second resistor R2, a first end of the second resistor R2 is connected to the source of the electronic switch tube, a second end of the second resistor R2 is connected to the gate of the electronic switch tube and a first end of the first resistor R1, respectively, and a second end of the first resistor R1 is externally connected to the first control signal.
In the present embodiment, the switching circuit of the present application may be connected in series at any position in the dc circuit to be turned on or off. Preferably, the switch circuit of the present application is connected in series to the ground of the power supply loop of the load RL, as shown in fig. 1, the first end of the normally open contact K1 is connected to the low potential end of the load RL, and the second end of the normally open contact K1 is connected to ground, so that the first control signal level is not raised, and the control signal level is conveniently configured.
In a preferred embodiment, as shown in fig. 1, the coil control circuit includes a transistor, a third resistor R3 and a fourth resistor R4, a first end of the third resistor R3 is externally connected with the second control signal, a second end of the third resistor R3 is respectively connected with a base of the transistor and a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected with an emitter of the transistor, and a collector and an emitter of the transistor are connected in series in the coil power supply loop of the relay.
In this embodiment, preferably, the first end of the relay coil is connected to the coil power supply, the second end of the relay coil is connected to the collector of the transistor, and the second end of the fourth resistor R4 is grounded to the emitter of the transistor, so that the level of the second control signal is not raised, and the configuration is facilitated.
In a preferred embodiment, as shown in fig. 1 and 2, a first diode D1 is further included, a cathode of the first diode D1 is connected to the high potential terminal after the relay coil is energized, and an anode of the first diode D1 is connected to the low potential terminal after the relay coil is energized.
In the present embodiment, the on direction of the first diode D1 is opposite to the current direction when the relay coil is on.
The utility model also discloses a switch circuit for direct current heavy current occasion, in a preferred embodiment, as shown in fig. 2, switch circuit includes relay, the coil control circuit of the coil switching on or switching off of control relay, first electronic switch pipe Q1 and second electronic switch pipe Q2; the normally open contact K1 of relay is concatenated in waiting to switch on or the direct current return circuit that cuts off, the source electrode of second electron switch pipe Q2 is connected with the first end of normally open contact K1, the drain electrode of second electron switch pipe Q2 is connected with the drain electrode of first electron switch pipe Q1, the source electrode of first electron switch pipe Q1 is connected with the second end of normally open contact K1, the external first control signal of grid of first electron switch pipe Q1, the external third control signal of grid of second electron switch pipe Q2.
In this embodiment, will when needs will the utility model discloses a when switch circuit becomes the closed condition from the off-state, first input first control signal and third control signal make electronic switch pipe Q1 and Q2 switch on respectively, input second control signal again and make the relay coil circular telegram, actuation relay normally open contact closure after the coil circular telegram, switch circuit gets into the closed condition, will when needs the utility model discloses a when switch circuit becomes the off-state from the closed condition, close first second control signal and make the relay coil outage, and then the disconnection of relay normally open contact, it makes electronic switch pipe Q1 and Q2 disconnection to close first control signal and third control signal again, and switch circuit gets into the off-state, owing to and having electronic switch, can not produce electric arc when relay normally open contact is opened or is closed and let the contact damage, reaches the effect of arc extinguishing.
In this embodiment, the electronic switches Q1 and Q2 are preferably, but not limited to, NMOS transistors, and in this case, the parasitic diode structures of the electronic switches Q1 and Q2 are schematically shown in fig. 3. The direction of current through the switching circuit may be from the electronic switches Q1 to Q2, or from the electronic switches Q2 to Q1. When the current direction is from the electronic switch tube Q1 to the electronic switch tube Q2, the conduction direction of the parasitic diode (NMOS) of the electronic switch tube Q1 is the same as the current direction, and the conduction direction of the parasitic diode (NMOS) of the electronic switch tube Q2 is opposite to the current direction, so that the circuit can be protected from overvoltage; when the current direction is from the electronic switch Q2 to the electronic switch Q1, the parasitic diode (NMOS) of the electronic switch Q1 is turned on in the opposite direction to the current direction, so that the circuit can be protected from overvoltage. In a preferred embodiment, as shown in fig. 2, a second gate voltage supply circuit and/or a third gate voltage supply circuit is further included; the second grid voltage power supply circuit comprises a fifth resistor R5 and a sixth resistor R6, the first end of the fifth resistor R5 is externally connected with a first control signal, the second end of the fifth resistor R5 is respectively connected with the first end of the sixth resistor R6 and the grid electrode of the first electronic switching tube Q1, and the second end of the sixth resistor R6 is respectively connected with the source electrode of the first electronic switching tube Q1; the third grid voltage power supply circuit comprises a seventh resistor R7 and an eighth resistor R8; a first end of the eighth resistor R8 is externally connected to a third control signal, a second end of the eighth resistor R8 is connected to a first end of the seventh resistor R7 and the gate of the second electronic switch Q2, and a second end of the seventh resistor R7 is connected to the source of the second electronic switch Q2.
In this embodiment, the source of the first electronic switch Q1 is preferably grounded.
In a preferred embodiment, as shown in fig. 2, the coil control circuit includes a transistor, a third resistor R3 and a fourth resistor R4, a first end of the third resistor R3 is externally connected with the second control signal, a second end of the third resistor R3 is respectively connected with a base of the transistor and a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected with an emitter of the transistor, and a collector and an emitter of the transistor are connected in series in the coil power supply loop of the relay.
In a preferred embodiment, as shown in fig. 2, a first diode D1 is further included, a cathode of the first diode D1 is connected to the high potential terminal after the relay coil is energized, and an anode of the first diode D1 is connected to the low potential terminal after the relay coil is energized.
The utility model also discloses a battery charge-discharge control circuit, in an preferred embodiment, as shown in FIG. 2, battery charge-discharge control circuit includes the above-mentioned switch circuit who is used for direct current heavy current occasion, and normally open contact's first end is connected with the negative pole of battery, and normally open contact's second end is connected with ground.
In the present embodiment, the positive electrode of the battery is connected to a load or a charging module for charging the battery. The process of controlling charging and discharging of the battery charging and discharging control circuit comprises the following steps: the default relays, Q1, and Q2 are initially in an open state. When charging, respectively inputting a first control signal and a third control signal to a first electronic switch tube Q1 and a second electronic switch tube Q2 to close Q1 and Q2, then inputting a second control signal to close a normally open contact of a relay, after charging is finished, disconnecting the second control signal to open the normally open contact of the relay, then disconnecting the first control signal to open the first electronic switch tube Q1, entering a pre-discharge state, in the pre-discharge state, as shown in figure 3, a closed second electronic switch tube Q2 and a parasitic diode of a first electronic switch tube Q1 form a pre-discharge circuit together, which can not cause the power failure of a load (such as a base station load) at the moment of power failure, the pre-discharge circuit can provide electric energy for the load, after the power failure confirms to use a battery for power supply, sequentially respectively inputting the first control signal and the second control signal to the first electronic switch tube Q1 and a coil control circuit of the relay to sequentially close the normally open contact of the Q1 and the relay K1 to enter a discharge state, the current direction in the discharge state is Q1 to Q2. After the battery is discharged, the second control signal is firstly disconnected to disconnect the normally open contact K1 of the relay, then the third control signal is disconnected to disconnect the second electronic switch tube Q2, the parasitic diodes of the first electronic switch tube Q1 and the second electronic switch tube Q2 which are closed form a pre-charging loop together, the pre-charging loop enables the battery to be directly charged after the power is on, and when the battery is charged after the power is on, the third control signal and the second control signal are sequentially and respectively input to the second electronic switch Q2 and the coil control circuit of the relay, so that the Q2 and the normally open contact K1 of the relay are sequentially closed to enter a charging state. In summary, the pre-charging circuit and the pre-discharging circuit respectively aim at two states of the battery after the battery is discharged and is cut off and is charged and saturated, so that the pre-charging circuit is closed after the battery is discharged, the battery can be charged after the battery is powered on, the pre-discharging circuit is closed after the battery is charged, and the load cannot be powered off after the power failure.
In this embodiment, the first control signal, the second control signal and the third control signal input from the outside can be output through the I/O interface of the external microprocessor, or can be obtained by configuring a manual switch circuit.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A switching circuit for a direct current large current occasion is characterized by comprising a relay, a coil control circuit for controlling the coil of the relay to be electrified or powered off, an electronic switching tube and a first grid voltage power supply circuit;
the normally open contact of the relay is connected in series in a direct current loop to be switched on or switched off, the source electrode and the drain electrode of the electronic switching tube are respectively connected with two ends of the normally open contact, the input end of the first grid voltage power supply circuit is externally connected with a first control signal, and the output end of the first grid voltage power supply circuit is connected with the grid electrode of the electronic switching tube;
and the input end of the coil control circuit is externally connected with a second control signal.
2. The switch circuit for high dc current applications as claimed in claim 1, wherein the first gate voltage supply circuit comprises a first resistor and a second resistor, a first end of the second resistor is connected to the source of the electronic switch transistor, a second end of the second resistor is connected to the gate of the electronic switch transistor and the first end of the first resistor, respectively, and a second end of the first resistor is externally connected to the first control signal.
3. The switch circuit for high dc current applications as claimed in claim 1, wherein the coil control circuit comprises a transistor, a third resistor and a fourth resistor, a first end of the third resistor is externally connected to the second control signal, a second end of the third resistor is respectively connected to a base of the transistor and a first end of the fourth resistor, a second end of the fourth resistor is connected to an emitter of the transistor, and a collector and an emitter of the transistor are connected in series to the coil power supply loop of the relay.
4. The switching circuit for high dc current applications as recited in claim 1, further comprising a first diode, wherein a cathode of said first diode is connected to the high potential terminal of said relay coil after energization, and an anode of said first diode is connected to the low potential terminal of said relay coil after energization.
5. A switching circuit for a direct current large current occasion is characterized by comprising a relay, a coil control circuit for controlling the coil of the relay to be electrified or powered off, a first electronic switching tube and a second electronic switching tube;
the normally open contact of the relay is connected in series in a direct current loop to be switched on or switched off, the source electrode of the second electronic switch tube is connected with the first end of the normally open contact, the drain electrode of the second electronic switch tube is connected with the drain electrode of the first electronic switch tube, the source electrode of the first electronic switch tube is connected with the second end of the normally open contact, the grid electrode of the first electronic switch tube is externally connected with a first control signal, and the grid electrode of the second electronic switch tube is externally connected with a third control signal.
6. The switching circuit for high dc current applications as claimed in claim 5, further comprising a second gate voltage supply circuit and/or a third gate voltage supply circuit;
the second grid voltage power supply circuit comprises a fifth resistor and a sixth resistor, wherein the first end of the fifth resistor is externally connected with a first control signal, the second end of the fifth resistor is respectively connected with the first end of the sixth resistor and the grid electrode of the first electronic switching tube, and the second end of the sixth resistor is respectively connected with the source electrode of the first electronic switching tube;
the third grid voltage power supply circuit comprises a seventh resistor and an eighth resistor; the first end of the eighth resistor is externally connected with a third control signal, the second end of the eighth resistor is respectively connected with the first end of the seventh resistor and the grid electrode of the second electronic switching tube, and the second end of the seventh resistor is respectively connected with the source electrode of the second electronic switching tube.
7. The switch circuit for high dc current applications as claimed in claim 5, wherein the coil control circuit comprises a transistor, a third resistor and a fourth resistor, a first end of the third resistor is externally connected to the second control signal, a second end of the third resistor is respectively connected to a base of the transistor and a first end of the fourth resistor, a second end of the fourth resistor is connected to an emitter of the transistor, and a collector and an emitter of the transistor are connected in series to the coil power supply loop of the relay.
8. The switching circuit for high dc current applications as recited in claim 5, further comprising a first diode, wherein a cathode of said first diode is connected to the high potential terminal of said relay coil after energization, and an anode of said first diode is connected to the low potential terminal of said relay coil after energization.
9. A battery charge and discharge control circuit, comprising the switch circuit for dc high current application as claimed in any one of claims 1 to 7, wherein the first end of the normally open contact is connected to the negative electrode of the battery, and the second end of the normally open contact is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120792547.5U CN214956636U (en) | 2021-04-19 | 2021-04-19 | Switch circuit for DC heavy current occasion and battery charging and discharging control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120792547.5U CN214956636U (en) | 2021-04-19 | 2021-04-19 | Switch circuit for DC heavy current occasion and battery charging and discharging control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214956636U true CN214956636U (en) | 2021-11-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120792547.5U Active CN214956636U (en) | 2021-04-19 | 2021-04-19 | Switch circuit for DC heavy current occasion and battery charging and discharging control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214956636U (en) |
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2021
- 2021-04-19 CN CN202120792547.5U patent/CN214956636U/en active Active
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