CN215263913U - Access detection circuit and battery system - Google Patents
Access detection circuit and battery system Download PDFInfo
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- CN215263913U CN215263913U CN202121634756.3U CN202121634756U CN215263913U CN 215263913 U CN215263913 U CN 215263913U CN 202121634756 U CN202121634756 U CN 202121634756U CN 215263913 U CN215263913 U CN 215263913U
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Abstract
The utility model discloses an insert detection circuitry for the switching device both ends on the charge-discharge major loop of hookup battery, the break-make in switching device control charge-discharge major loop. The access detection circuit comprises a constant current source circuit, a photoelectric coupler and a switch circuit, wherein the transmitting end of the photoelectric coupler is connected with the constant current source circuit, the switch circuit is connected with the receiving end of the photoelectric coupler, and when the charge-discharge main circuit is connected with a load/charger, the constant current source circuit outputs current to enable the receiving end of the photoelectric coupler to be conducted, so that the switch circuit is conducted. The utility model realizes automatic load/charger identification without changing the existing load/charger and without complex auxiliary circuit, special communication interface and communication protocol, has strong universality, and can realize seamless replacement with the existing lead-acid system; and the access detection circuit is simple and reliable, and can be compatible with the same port and the branch port. Additionally, the utility model discloses still disclose a battery system who has this access detection circuitry.
Description
Technical Field
The utility model relates to a circuit design technical field especially relates to an automatic access detection circuitry and battery system that discernment charger/load inserts.
Background
In practical application, in order to make the lithium ion battery compatible with the existing lead-acid battery system, a same-port mode is required. Therefore, when the working conditions of the battery, such as standby, charging, discharging, etc., need to be determined in order to execute the corresponding control strategy, the conventional common method is to use a relatively complex Battery Management System (BMS), a dedicated communication interface, and a communication protocol to communicate with the battery and the charger/load system.
However, such BMS system architectures and algorithms suffer from the following drawbacks: firstly, the circuit structure is complex, the cost is high, and the reliability is poor; secondly, data are transmitted by depending on a connector, a wire harness or other communication links, so that the cost is high and the reliability is poor; and thirdly, the charger/load system needs to be customized/correspondingly matched, so that the improvement is realized, and the universality is poor.
Therefore, it is desirable to provide a new access detection mechanism to automatically detect and identify the charger/load without modifying the existing charger/load and without requiring complex auxiliary circuits, dedicated communication interfaces and communication protocols.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an insert detection circuitry to need not to change current charger/load, need not to realize automated inspection discernment charger/load under the condition of complicated auxiliary circuit, special communication interface and communication protocol.
Another object of the present invention is to provide an access detection circuit to realize automatic detection and identification of charger/load under the condition of no need of changing the existing charger/load, no need of complex auxiliary circuit, special communication interface and communication protocol.
In order to achieve the above object, the utility model provides an insert detection circuitry for the switching device both ends on the charge-discharge major loop of hookup, switching device control the break-make of charge-discharge major loop. The access detection circuit comprises a constant current source circuit, a photoelectric coupler and a switch circuit, wherein the transmitting end of the photoelectric coupler is connected with the constant current source circuit, the switch circuit is connected with the receiving end of the photoelectric coupler, and when the charge-discharge main circuit is accessed to a load/charger, the constant current source circuit outputs current to enable the receiving end of the photoelectric coupler to be conducted, so that the switch circuit is conducted.
Preferably, the switching circuit is connected to the switching device, and when the switching circuit is turned on, the switching device is turned on to turn on the charge and discharge main circuit.
Preferably, the switching circuit includes a field effect transistor T1 and a thyristor T2, a gate of the field effect transistor T1 is coupled to a receiving terminal of the photocoupler, the thyristor T2 is coupled to a source of the field effect transistor T1, and when the receiving terminal of the photocoupler is turned on, the field effect transistor T1 is turned on to turn on the thyristor T2.
Preferably, the switch circuit further includes a first resistor R1, a second resistor R2, and a third resistor R3, the first resistor R1 is connected between the gate of the fet T1 and ground, the second resistor R2 is connected between the source of the fet T1 and ground, the third resistor R3 is connected in series between the source of the fet T1 and the control electrode of the thyristor T2, and the cathode of the thyristor T2 is grounded.
Specifically, the anode of the thyristor T2 is connected to the switching device, and when the thyristor T2 is turned on, the switching device is turned on to turn on the charge/discharge main circuit.
Specifically, the switching device is a relay, the anode of the thyristor T2 is connected with the coil of the switching device, and when the thyristor T2 is switched on, the coil of the switching device is electrified to enable the contact to be attracted and switched on the charging and discharging main loop.
Preferably, the constant current source circuit includes a fourth resistor R, a voltage reference element, and a fifth resistor RSAnd a triode Q1, the fourth resistor R is connected with the base of the triode Q1, and the fifth resistor RSThe emitter of the triode Q1, the voltage reference element and the fifth resistor R are connectedSIn parallel, the fifth resistor RSThe emitting end of the photoelectric coupler is connected with the collector of the triode Q1.
Preferably, the voltage reference element comprises a first diode D1 and a second diode D2 connected in series.
Preferably, the access detection circuit further includes a zener diode Z1, a cathode of the zener diode Z1 is connected to the charge and discharge main circuit, and an anode of the zener diode Z1 is connected to the constant current source circuit.
In order to achieve the above object, the utility model provides a battery system, including the charge-discharge major loop and insert detection circuitry, insert detection circuitry as above.
Compared with the prior art, the utility model discloses an access detection circuitry parallel connection is on the charge-discharge major loop of battery, and when load/charger insert the charge-discharge major loop, constant current source circuit output current made optoelectronic coupler's receiving terminal switch on and make switch circuit switch on, has realized automated inspection discernment load/charger to can open the relevant control function of battery. The utility model realizes automatic load/charger identification without changing the existing load/charger and without complex auxiliary circuit, special communication interface and communication protocol, has strong universality, and can realize seamless replacement with the existing lead-acid system; and the access detection circuit is simple and reliable, and can be compatible with the same port and the branch port. In addition, after the charging and discharging main loop is conducted, the access detection circuit can be automatically bypassed, and the power consumption is reduced.
Drawings
Fig. 1 is a typical battery and load equivalent circuit diagram.
Fig. 2 is a schematic diagram of a load access detection function according to an embodiment of the present invention.
Fig. 3 is a typical battery and charger equivalent circuit diagram.
Fig. 4 is a schematic diagram of the access detection function of the charger according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the present invention and are not intended to limit the invention to the particular embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the described embodiments without inventive step, are intended to be within the scope of the present invention.
Referring to fig. 1 to 4, the battery system of the present invention includes a charging/discharging main circuit 101 and an access detection circuit 102. Wherein, in the battery discharging state, the charging and discharging main loop 101 is a loop for supplying power to the load 2 by the battery pack 1; in the battery charging state, the charge and discharge main circuit 101 is a circuit for the charger 3 to supply power to the battery pack 1. The charge and discharge main loop 101 is connected in series with a switching device, and the switching device controls the on and off of the charge and discharge main loop 101. When the load 2/the charger 3 is connected to the charge and discharge main circuit 101 and the switching device is closed, the charge and discharge main circuit 101 is conducted, and the battery pack 1 can be charged/discharged through the charge and discharge main circuit 101. The access detection circuit 102 is connected in parallel to both ends of the switching device to automatically detect and identify the load 2/charger 3 when the load 2/charger 3 is accessed to the charging and discharging main loop 101, so that the related control function of the battery pack 1 can be turned on.
Referring to fig. 1 and fig. 3, fig. 1 and fig. 3 respectively show a typical equivalent circuit diagram of a battery and a load (charge and discharge main circuit 101) and an equivalent circuit diagram of a battery and a charger (charge and discharge main circuit 101). As shown in fig. 1, when the load 2 is connected (or the ACC start load 2 is further pressed), and the switching device is closed, the charging and discharging main circuit 101 is turned on, and the battery pack 1 can charge the load 2. As shown in fig. 3, when the charger 3 is connected (the charger 3 is turned ON by pressing ON/OFF) and the switching device is closed, the charging/discharging main circuit 101 is turned ON, and the charger 3 can charge the battery pack 1.
Referring to fig. 2, fig. 2 shows a schematic diagram of a load access detection function according to an embodiment, as shown in fig. 2, the access detection circuit 102 includes a constant current source circuit 4, a photocoupler and a switch circuit 5, a transmitting terminal a of the photocoupler is connected to the constant current source circuit 4, and an input terminal of the switch circuit 5 is connected to a receiving terminal B of the photocoupler. When the charge and discharge main circuit 101 is connected to the load 2 (or the ACC start load 2 is further pressed), the constant current source circuit 4 outputs a current to turn on the transmitting terminal a of the photoelectric coupler to emit light, so that the receiving terminal B of the photoelectric coupler is turned on, and the switching circuit 5 is turned on.
In this embodiment, the switch circuit 5 is connected to the switch device, and when the switch circuit 5 is turned on, the switch device is turned on, and the charge and discharge main circuit 101 is turned on. That is, the on/off of the switching device is controlled by the connection detection circuit 102, and when the connection of the load 2 is detected, the charge/discharge main circuit 101 is turned on, and power is supplied to the load 2. Of course, the switch circuit 5 is connected to the switch device to control the on/off of the charging/discharging main circuit 101 is only an example of the present invention, and in the specific implementation, the switch circuit 5 may be any unit/module connected to the battery system, for example, connected to the BMS system to provide a load access signal to the BMS system, so that the BMS system knows that the current state of the battery pack 1 is discharging/charging, and then executes a corresponding control strategy according to the current state of the battery pack 1.
As shown in fig. 2, specifically, the fourth resistor R and the fifth resistor RSThe constant current source circuit 4 consists of a first diode D1, a second diode D2 and a triode Q1, a fourth resistor R is connected with the base electrode of the triode Q1, and a fifth resistor RSConnected between the emitter of the transistor Q1 and ground, and a first diode D1, a second diode D2 connected in series, and a fifth resistor RSIn parallel, a fifth resistor RSThe output current of the constant current source circuit 4, and the emitting end a of the photoelectric coupler is connected between the collector of the triode Q1 and the load 2. The constant current source circuit 4 is in a normally open state, before the load 2 is connected, the triode Q1 is in a cut-off state, the constant current source circuit 4 has no current output, and when the load is connectedAfter 2, the triode Q1 is turned on, and the constant current source circuit 4 outputs a constant current to supply power to the photoelectric coupler, so that the emitting end a of the photoelectric coupler emits light, and the receiving end B of the photoelectric coupler is turned on.
In the embodiment shown in fig. 2, according to the characteristics of the emitting end a of the actually selected photocoupler, the fifth resistor R with the corresponding resistance is selectedSFrom a fifth resistor RSThe output current of the constant current source circuit 4 is set to satisfy the current required by the normal operation of the transmitting terminal a and the receiving terminal B of the photoelectric coupler. The first diode D1 and the second diode D2 connected in series form a voltage reference element, the anode of the second diode D2 is connected with the base of the triode Q1, the cathode of the second diode D2 is connected with the anode of the first diode D1, and the cathode of the first diode D1 is grounded. Of course, the implementation is not limited to using two diodes D1, D2 as the voltage reference elements, but may be a diode, three diodes, etc., or may be replaced by other elements that can provide a stable voltage reference, such as a zener diode.
Referring to fig. 2, the switch circuit 5 includes a fet T1, a thyristor T2, a first resistor R1, a second resistor R2, and a third resistor R3. The drain of the field effect transistor T1 is connected with a power supply VCC, the receiving end B of the photoelectric coupler is connected between the power supply VCC and the grid of the field effect transistor T1, the first resistor R1 is connected between the grid of the field effect transistor T1 and the ground, the second resistor R2 is connected between the source of the field effect transistor T1 and the ground, the third resistor R3 is connected in series between the source of the field effect transistor T1 and the control electrode of the controllable silicon T2, the anode of the controllable silicon T2 is connected with a switching device, and the cathode of the controllable silicon T2 is grounded. When the load 2 is connected by pressing (or the ACC start load 2 is further pressed), the triode Q1 is turned on, and the constant current output by the constant current source circuit 4 makes the emitting end a of the photoelectric coupler emit light, so that the MOSFET (field effect transistor) of the receiving end B of the photoelectric coupler is turned on, and further the field effect transistor T1 and the thyristor T2 are turned on.
In the embodiment shown in fig. 2, the switching device is a Relay, the Coil Relay _ Coil of the switching device is connected between the anode of the thyristor T2 and the power supply VCC, and when the thyristor T2 is turned on, the Coil Relay _ Coil of the switching device is energized to attract the Contact Relay _ Contact to turn on the charge and discharge main circuit 101. At this time, the battery pack 1 supplies power to the load 2, and the battery pack 1 is in a discharge state; meanwhile, as the switch device is conducted, the access detection circuit 102 is bypassed by the Contact Relay _ Contact, the working current is reduced, and the power consumption is low. Of course, the switching device is a relay, which is only an example of the present invention, and other switching devices such as MOSFET (field effect transistor), IGBT (insulated gate bipolar transistor) and the like may be used instead.
Further, the access detection circuit 102 further includes a zener diode Z1, a cathode of the zener diode Z1 is connected to the load 2, and an anode of the zener diode Z1 is connected to the constant current source circuit 4. If the voltage of the battery pack 1 is lower than the normal voltage value (the reverse breakdown voltage of the zener diode Z1 is selected, and a suitable zener diode Z1 can be selected according to the actual application requirement), the zener diode Z1 is cut off to turn off the access detection circuit 102, thereby realizing the under-voltage protection of the battery pack 1.
Referring next to fig. 4, fig. 4 is a schematic diagram illustrating a charger access detection function according to an embodiment. In the charger connection detection function schematic diagram shown in fig. 4, the basic components of the constant current source circuit 4, the photocoupler and the switch circuit 5 are the same as those of the load connection detection function schematic diagram shown in fig. 2. When the charge and discharge main loop 101 is connected to the charger 3 (the charger 3 is started by pressing ON/OFF), the triode Q1 is conducted, the constant current source circuit 4 outputs constant current to supply power to the photoelectric coupler, the transmitting end A of the photoelectric coupler is conducted to emit light, the MOSFET of the receiving end B of the photoelectric coupler is conducted, the field effect tube T1 and the silicon controlled rectifier T2 are conducted, and then the Coil Relay _ Coil of the switching device is electrified to enable the Contact Relay _ Contact to be attracted and conducted to the charge and discharge main loop 101. Based on the difference between the current flowing directions of the battery pack 1 in the charging state and the discharging state, the difference from the schematic diagram of the load access detection function shown in fig. 2 is that the cathode of the zener diode Z1 shown in fig. 4 is connected to the cathode of the battery pack 1, the anode of the zener diode Z1 is connected to the constant current source circuit 4, and the fifth resistor R of the constant current source circuit 4SIs connected with the negative electrode of the charger 3.
To sum up, the utility model discloses an access detection circuitry 102 parallel connection is on the charge-discharge major loop 101 of battery, and when load 2 charger 3 inserts charge-discharge major loop 101, constant current source circuit 4 output current made optoelectronic coupler's receiving terminal B switch on and make switch circuit 5 switch on, has realized automated inspection discernment load 2 charger 3 to can open the relevant control function of battery. The utility model discloses need not to change current load 2 charger 3, need not to realize automatic load 2 charger 3 discernments under the condition of complicated auxiliary circuit, special communication interface and communication protocol, the commonality is strong, can realize with the seamless replacement of current lead acid system. Moreover, the access detection circuit 102 is simple and reliable, and can be compatible with the same port and the different ports. In addition, the photoelectric coupler has a good isolation effect, and meanwhile, the photoelectric coupler is driven by outputting stable current based on the constant current source circuit 4, so that the reliability is high. In addition, after the charging and discharging main loop 101 is conducted, the access detection circuit 102 can be automatically bypassed, and the power consumption is reduced.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. An access detection circuit is used for being connected with two ends of a switch device on a charge-discharge main loop of a battery in parallel, and the switch device controls the on-off of the charge-discharge main loop.
2. The access detection circuit of claim 1, wherein the switching circuit is connected to the switching device, and when the switching circuit is turned on, the switching device is turned on to turn on the charge/discharge main circuit.
3. The access detection circuit of claim 1, wherein the switch circuit comprises a fet T1 and a thyristor T2, a gate of the fet T1 is coupled to a receiving terminal of the photocoupler, the thyristor T2 is coupled to a source of the fet T1, and when the receiving terminal of the photocoupler is turned on, the fet T1 is turned on to turn on the thyristor T2.
4. The access detection circuit of claim 3, wherein the switch circuit further comprises a first resistor R1, a second resistor R2, and a third resistor R3, the first resistor R1 is connected between the gate of the FET T1 and ground, the second resistor R2 is connected between the source of the FET T1 and ground, the third resistor R3 is connected in series between the source of the FET T1 and the control electrode of the thyristor T2, and the cathode of the thyristor T2 is grounded.
5. The access detection circuit of claim 4, wherein an anode of the thyristor T2 is connected to the switching device, and when the thyristor T2 is turned on, the switching device is turned on to turn on the charge/discharge main circuit.
6. The access detection circuit of claim 5, wherein the switch device is a relay, an anode of the thyristor T2 is connected to a coil of the switch device, and when the thyristor T2 is turned on, the coil of the switch device is energized to pull a contact into the charge and discharge main circuit.
7. The access detection circuit of claim 1 wherein said constant current source circuit comprises a fourth resistor R, a voltage reference element, a fifth resistor RSAnd a triode Q1, the fourth resistor R is connected with the base of the triode Q1, and the fifth resistor RSThe emitter of the triode Q1, the voltage reference element and the fifth resistor R are connectedSIn parallel, the fifth resistor RSThe emitting end of the photoelectric coupler is connected with the collector of the triode Q1.
8. The access detection circuit of claim 7 wherein the voltage reference element comprises a first diode D1 and a second diode D2 connected in series.
9. The access detection circuit of claim 1, further comprising a zener diode Z1, wherein a cathode of the zener diode Z1 is connected to the charge and discharge main circuit, and an anode of the zener diode Z1 is connected to the constant current source circuit.
10. A battery system comprising a main charging and discharging circuit and an access detection circuit, the access detection circuit being as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121634756.3U CN215263913U (en) | 2021-07-16 | 2021-07-16 | Access detection circuit and battery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121634756.3U CN215263913U (en) | 2021-07-16 | 2021-07-16 | Access detection circuit and battery system |
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| Publication Number | Publication Date |
|---|---|
| CN215263913U true CN215263913U (en) | 2021-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121634756.3U Active CN215263913U (en) | 2021-07-16 | 2021-07-16 | Access detection circuit and battery system |
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|---|---|
| CN (1) | CN215263913U (en) |
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- 2021-07-16 CN CN202121634756.3U patent/CN215263913U/en active Active
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