CN212667173U - Control circuit - Google Patents

Abstract

The utility model relates to a control field discloses a control circuit. The utility model discloses in, control circuit includes: the auxiliary source module is used for outputting power supply voltage for the timing module based on the high voltage of the power battery, and the power supply voltage is low voltage; the timing module is powered on based on the input power supply voltage and is used for sending a wake-up signal to the dormant battery management system BMS at regular time according to preset time; and the auxiliary source control module is used for controlling the auxiliary source module to stop outputting the power supply voltage to the timing module when the power battery is overhauled. The control circuit can reduce the probability of electrification of two ends of the MSD when the power battery is overhauled, so that the normal assembly of the power battery is ensured.

Description

Control circuit

Technical Field

The utility model relates to a control field, in particular to control circuit.

Background

The vehicle-mounted direct current (DC/DC) converter converts the high voltage of the power battery pack into a constant 12V or 24V low voltage. The low voltage can not only supplement power for the auxiliary lead-acid storage battery, but also supply power for a low-voltage system of the whole vehicle. The low-voltage system comprises an air conditioner, a car lamp, a radio, a power steering, a driving control, a power car window, a battery management system, a defrosting device, a loudspeaker, a windscreen wiper, an instrument and the like, and the total power of the low-voltage device in the conventional electric car reaches the kilowatt (kW) level. With the rapid development of the new energy industry, battery safety events occur more and more frequently in the visual field of the public. Real-time monitoring of battery status is beginning to become an effective means for preventing battery pack fires and explosions in the industry. In certain big cities, even 24h monitoring of the battery state of the new energy automobile is taken as a basic requirement for the automobile enterprises to enter the market.

The inventor finds that at least the following problems exist in the prior art: after a high-voltage Manual Maintenance Switch (MSD) is disconnected, a stable high voltage still exists at two ends of the MSD measured by using a multimeter in the conventional DC/DC converter. When a factory worker assembles a power battery pack (pack), after the stable high voltage is detected, the pack cannot be assembled continuously, so that the production and the manufacture of the pack are greatly influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a control circuit for can reduce the electrified probability in MSD both ends when power battery overhauls, thereby guarantee power battery's normal assembly.

In order to solve the above technical problem, an embodiment of the present invention provides a control circuit, including: the auxiliary source module is used for outputting power supply voltage for the timing module based on the high voltage of the power battery, and the power supply voltage is low voltage; the timing module is powered on based on the input power supply voltage and is used for sending a wake-up signal to the dormant battery management system BMS at regular time according to preset time; and the auxiliary source control module is used for controlling the auxiliary source module to stop outputting the power supply voltage to the timing module when the power battery is overhauled.

The utility model discloses embodiment is for prior art, and the auxiliary source module is based on power battery's high-tension electricity, for the power supply of timing module. When the power battery is overhauled, the auxiliary source control module controls the auxiliary source module to stop outputting the power supply voltage to the timing module. The branch where the auxiliary source module is located in the control circuit can be disconnected from the power battery in the process of overhauling the power battery while the timing monitoring function is kept. In the process of power battery maintenance, the branch where the auxiliary source module is located is disconnected from the power battery, and a universal meter cannot detect stable high voltage at two ends of the MSD, so that normal assembly of the power battery is guaranteed.

In some embodiments, the control circuit further comprises: the power supply input end of the auxiliary source control module and the sampling module are respectively connected with the power battery through the first control switch; the sampling module is used for sampling the electric signal of the power battery; when the power battery is overhauled, the first control switch is switched to a disconnection state so as to disconnect the connection between the power battery and the sampling module and the connection between the power battery and the power supply input end of the auxiliary source control module.

In some embodiments, the control circuit further comprises: a switch control module; and the switch control module is used for controlling the on-off of the first control switch based on the control signal output by the main control module and/or the external wake-up signal.

In some embodiments, the switch control module comprises: a first triode and a second triode; the first end of the first triode is used as a first external connection end of the switch control module and is connected with the first end of the first control switch; the control end of the first triode is connected with the first end of the second triode, a node between the control end of the first triode and the first end of the second triode is used as a second external connection end of the switch control module and a third external connection end of the switch control module, the second external connection end is connected with the second end of the first control switch, and the third external connection end is used for receiving an external wake-up signal; the second end of the first triode is grounded; the control end of the second triode is used as the fourth external connection end of the switch control module and used for receiving a control signal; the second end of the second triode is grounded; the first control switch switches the working state based on the electric signal of the first end of the first control switch and the electric signal of the second end of the first control switch, and the working state comprises a conducting state and a disconnecting state.

In some embodiments, the first control switch is an opto-coupler.

In some embodiments, the control circuit further comprises: a main control module; and the main control module is used for controlling the auxiliary source control module so as to control the auxiliary source control module to stop outputting the power supply voltage to the timing module when the power battery is overhauled.

In some embodiments, the secondary source control module comprises: the auxiliary source module is connected with the power battery through the second control switch; the auxiliary source control assembly is used for controlling the on-off of the second control switch; and the second control switch is switched to a disconnection state when the power battery is overhauled so as to disconnect the connection between the auxiliary source module and the power battery.

In some embodiments, the power input of the auxiliary source control module is connected to the auxiliary source module, and the auxiliary source control module is powered on based on the supply voltage and the power battery.

In some embodiments, the control circuit further comprises: and the auxiliary source control module is connected with the first control switch through the protection module.

In some embodiments, the circuitry of the secondary source module is a flyback circuit.

Drawings

Reference will now be made in detail to the drawings of the present application, which are to be considered illustrative and not restrictive, wherein elements having the same reference numeral designations represent like elements throughout, and wherein the drawings are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a control circuit according to a first embodiment of the present invention;

fig. 2 is a schematic diagram showing the connection of the control circuit, the MSD module and the power battery according to the first embodiment of the present invention shown in fig. 1;

fig. 3 is a schematic structural diagram of a control circuit according to a second embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a control circuit, an MSD module and a power battery according to a second embodiment of the present invention shown in fig. 3;

fig. 5 is a schematic structural diagram of a control circuit according to a third embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a control circuit, an MSD module and a power battery according to a third embodiment of the present invention shown in fig. 5;

fig. 7 is a schematic view showing a connection relationship between a first control switch and a photocoupler according to a third embodiment of the present invention shown in fig. 5;

fig. 8 is a schematic structural diagram of a control circuit according to a fourth embodiment of the present invention;

fig. 9 is a schematic structural diagram of a control circuit according to a fifth embodiment of the present invention;

fig. 10 is a schematic diagram showing the circuit connections of the control circuit, the power battery, the MSD module, and the power conversion module of the on-vehicle DCDC in the fifth embodiment shown in fig. 9;

fig. 11 is a schematic connection diagram of the on-vehicle DCDC converter, the power battery, the MSD module, and the multimeter constituted by the control circuit in the fifth embodiment shown in fig. 9;

fig. 12 is a schematic diagram showing a connection relationship between the on-vehicle DCDC converter according to the fifth embodiment of the present invention and another circuit of the electric vehicle.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.

The utility model discloses a first embodiment relates to a control circuit, include: the auxiliary source module is used for outputting power supply voltage for the timing module based on the high voltage of the power battery, and the power supply voltage is low voltage; the timing module is powered on based on the input power supply voltage and is used for sending a wake-up signal to the dormant battery management system BMS at regular time according to preset time; and the auxiliary source control module is used for controlling the auxiliary source module to stop outputting the power supply voltage to the timing module when the power battery is overhauled. In this embodiment, the module outputs a supply voltage. The branch where the auxiliary source module is located in the control circuit can be disconnected from the power battery in the process of overhauling the power battery while the timing monitoring function is kept. In the process of power battery maintenance, the branch where the auxiliary source module is located is disconnected from the power battery, and a universal meter cannot detect stable high voltage at two ends of the MSD, so that normal assembly of the power battery is guaranteed.

The following describes implementation details of the control circuit of the present embodiment, and the following description is provided only for the sake of understanding and is not essential to the present embodiment.

The control circuit in the present embodiment may be a control circuit in the vehicle-mounted DCDC converter, and is configured to control the power conversion module in the vehicle-mounted DCDC converter. As shown in fig. 1, the control circuit includes: a secondary source module 101, a timing module 102 and a secondary source control module 103. The auxiliary source module 101 is used for outputting a power supply voltage to the timing module 102 based on the high voltage of the power battery, wherein the power supply voltage is low voltage; the timing module 102 is powered on based on the input power supply voltage, and is configured to send a wake-up signal to a Battery Management System (BMS) in a sleep state at a fixed time according to a preset time; the auxiliary source control module 103 is configured to control the auxiliary source module 101 to stop outputting the power supply voltage to the timing module 102 when the power battery is overhauled.

In one embodiment, a schematic diagram of the connections of the control circuitry, MSD module and power cell is shown in fig. 2. The first end of the auxiliary source module 101 is connected with the power battery 201, the second end of the auxiliary source module 101 is connected with the MSD module 202 through the auxiliary source control module 103, and the MSD module 202 is connected with the power battery 201. The third terminal of the auxiliary source module 101 is connected to the timing module 102, and the fourth terminal of the auxiliary source module 101 is grounded. The auxiliary source module 101 converts a voltage between the first terminal of the auxiliary source module 101 and the second terminal of the auxiliary source module 101 into a supply voltage, and outputs the supply voltage from the third terminal of the auxiliary source module 101.

Because the input impedance of the vehicle-mounted DCDC converter is relatively small, the multimeter is equivalent to a large internal resistance; if the normally-hung branch is not disconnected in the vehicle-mounted DCDC converter, a high-voltage loop can be formed after the universal meter is connected, and the universal meter can measure a stable high voltage which is the voltage of the power battery 201. As can be seen from fig. 2, compared to the prior art that the normally-suspended branch is used to supply power to the timing module 102, in the present embodiment, the auxiliary source module 101 supplies power to the timing module 102, and the timing module 102 is powered on based on the power supply voltage provided by the auxiliary source module 101, so that the timing module 102 can send a wake-up signal to a Battery Management System (BMS) in a sleep state according to a preset time, so as to implement 24-hour monitoring of the power Battery 201 by the BMS System. A second end of the secondary source module 101 is connected to the MSD module 202 through the secondary source control module 103. When the power battery 201 is overhauled, the auxiliary source control module 103 controls the auxiliary source module 101 to stop outputting the power supply voltage to the timing module 102, that is, the auxiliary source control module 103 is in a disconnected state when the power battery 201 is overhauled. Because the auxiliary source control module 103 is disconnected, when the universal meter is used for detecting the voltage at the two ends of the MSD module 202, the control circuit is in a disconnected state, so that when the power battery 201 is overhauled, the branch where the auxiliary source module 101 is located cannot be communicated with the two ends of the MSD module 202, the MSD module 202 cannot be electrified due to the existence of the branch, and a factory line worker can overhaul the power battery 201 based on whether the two ends of the MSD module 202 are electrified or not. The problem of among the prior art, set up often to hang the branch road and supply power for timing module 102, when power battery 201 overhauls, should often hang the branch road and communicate MSD module 202 both ends for MSD module 202 both ends are electrified is solved.

It should be noted that, for clarity of description, in fig. 2, the first end of the auxiliary source module 101 is connected to the positive electrode of the power battery 201, and the second end of the auxiliary source module 101 is connected to the negative electrode of the power battery 201 through the auxiliary source control module 103 and the MSD module 202, and those skilled in the art can understand that, in practical applications, the auxiliary source control module 103 may also be connected between the first end of the auxiliary source module 101 and the positive electrode of the power battery 201, and the MSD module 202 may also be disposed at the positive electrode of the power battery 201.

In one embodiment, the circuitry of the auxiliary source module 101 is a flyback circuit, i.e., isolated by using a flyback transformer, converting the voltage of the power battery into a low voltage output.

It should be noted that, as will be understood by those skilled in the art, in practical applications, other transformers or other devices with a voltage transformation function may also be used for the auxiliary source module 101, and the specific circuit structure of the auxiliary source module 101 is not limited in this embodiment.

It should be noted that, as can be understood by those skilled in the art, the timing module 102 mentioned in the present embodiment may be a Real-Time Clock (RTC) module, or may be a microcontroller with an RTC function, and the present embodiment is not limited thereto.

In one embodiment, the secondary source control module 103 includes: the auxiliary source module 101 is connected with the power battery 201 through the second control switch; the auxiliary source control assembly is used for controlling the on-off of the second control switch; the second control switch is switched to the off state when the power battery 201 is repaired, so as to disconnect the connection between the auxiliary source module 101 and the power battery 201. The second control switch may be a transistor, such as an N-type transistor, and the auxiliary source control component may be the control chip UCC28C40, or may be another control chip, which is not limited in this embodiment.

It should be noted that, as can be understood by those skilled in the art, the auxiliary source control module 103 may also use a control device with integrated switch and control functions, and the specific structure of the auxiliary source control module 103 is not limited in this embodiment.

From this, for prior art, the utility model provides a control circuit, auxiliary source module 101 is based on power battery 201's high-tension electricity, for timing module 102 power supply. When the power battery 201 is overhauled, the auxiliary source control module 103 controls the auxiliary source module 101 to stop outputting the power supply voltage to the timing module 102. This makes it possible to disconnect the branch of the control circuit where the auxiliary source module 101 is located from the power battery 201 during the maintenance of the power battery 201 while maintaining the timing monitoring function. In the process of overhauling the power battery 201, the branch where the auxiliary source module 101 is located is disconnected from the power battery 201, and a multimeter is used for detecting no stable high voltage at two ends of the MSD, so that the normal assembly of the power battery 201 is ensured.

A second embodiment of the present invention relates to a control circuit, which is substantially the same as the first embodiment, and is mainly distinguished by: in the first embodiment, the control circuit further includes a sampling module and a first control switch, and the first control switch is switched to a disconnection state when the power battery is overhauled, so as to disconnect the connection between the power battery and the sampling module and the connection between the power battery and the power supply input end of the auxiliary power supply control module.

Specifically, as shown in fig. 3, the control circuit includes: an auxiliary source module 101, a timing module 102, an auxiliary source control module 103, a sampling module 104 and a first control switch 105. The functions and connection relationships of the auxiliary source module 101, the timing module 102, and the auxiliary source control module 103 may refer to the related description of the first embodiment, which is not repeated here, and the following mainly introduces the sampling module 104 and the first control switch 105:

in this embodiment, the power input end of the auxiliary source control module 103 and the first end of the sampling module 104 are respectively connected to the power battery 201 through the first control switch 105, that is, the auxiliary source control module 103 and the sampling module 104 are connected in parallel and are connected in series to the first control switch 105; the sampling module 104 is used for sampling an electric signal of the power battery 201; the first control switch 105 is switched to a disconnection state when the power battery 201 is overhauled, so as to disconnect the connection between the power battery 201 and the sampling module 104 and the connection between the power battery and the power supply input end of the auxiliary power supply control module 103.

In one embodiment, a schematic diagram of the connections of the control circuitry, MSD module and power cell is shown in fig. 4. The first end of the auxiliary source module 101 is connected with the power battery 201, the second end of the auxiliary source module 101 is connected with the first end of the auxiliary source control module 103, the second end of the auxiliary source control module 103 is connected with the first end of the MSD module 202, the first end of the first control switch 105 is connected with the power battery 201, the second end of the first control switch 105 is respectively connected with the first end of the sampling module 104 and the power input end of the auxiliary source control module 103, the second end of the sampling module 104 is connected with the first end of the MSD module 202, and the second end of the MSD module 202 is connected with the power battery 201. The third terminal of the auxiliary source module 101 is connected to the timing module 102, and the fourth terminal of the auxiliary source module 101 is grounded. The auxiliary source module 101 converts a voltage between the first terminal of the auxiliary source module 101 and the second terminal of the auxiliary source module 101 into a supply voltage, and outputs the supply voltage from the third terminal of the auxiliary source module 101.

As can be seen from fig. 4, in the present embodiment, when the sampling module 104 is present in the control circuit, the sampling module 104 is connected to the power battery 201 via the first control switch 105. When the first control switch 105 is turned off, the branch where the sampling module 104 is located is turned off, the auxiliary source control module 103 has no power input, and the auxiliary source control module 103 is in a turned-off state. Therefore, when the power battery 201 needs to be overhauled, the first control switch 105 is disconnected, that is, the connection between the power battery 201 and the sampling module 104 and the connection between the power battery 201 and the power input end of the auxiliary source control module 103 can be disconnected, so that the two ends of the MSD module 202 are not electrified due to the existence of the branch where the sampling module 104 is located and the branch where the auxiliary source module 101 is located, and the abnormal electrification of the two ends of the MSD module 202 due to the frequently-hung branch in the control circuit during circuit overhaul is further reduced.

It should be noted that, as can be understood by those skilled in the art, the sampling module 104 mentioned in this embodiment may be a high-voltage sampling module of the power battery 201, and may also be other sampling modules, and this embodiment is not limited.

It should be noted that, as will be understood by those skilled in the art, in practical applications, the first control switch 105 may be a manual switch or an electrical control switch, and the present embodiment does not limit the device type of the first control switch 105.

In one embodiment, the sampling module 102 may be a high voltage sampling module. The high-voltage sampling module comprises a resistor or a plurality of resistors connected in series.

In one embodiment, the power input of the auxiliary source control module 103 is connected to the auxiliary source module 101, and the auxiliary source control module 103 is powered up based on the supply voltage and the power battery 201.

It is worth mentioning that the auxiliary source module 101 supplies power to the auxiliary source control module 103, so that the auxiliary source control module 103 can continue to operate with the first control switch 105 turned off.

In an embodiment, in a case that a power input terminal of the auxiliary source control module 103 is connected to the auxiliary source module 101, and the auxiliary source control module 103 is powered on based on the supply voltage and the power battery 201, if the auxiliary source control module 103 is not connected to a chip outside the control circuit, the control circuit further includes: and a main control module. The main control module is connected with the outside, and the main control module is used for controlling the auxiliary source control module 103, so that the auxiliary source control module 103 controls the auxiliary source module 101 to stop outputting the power supply voltage to the timing module 102 when the power battery 201 is overhauled. The master control module receives external signals and controls various modules in the control circuit. The connection between the main control module and the outside may be a communication connection or a connection through a wire, which is not limited in this embodiment.

It is worth mentioning that the main control module controls all the modules in the control circuit, such as the auxiliary source control module 103, in a unified manner, so that the circuit design is simplified, and the functional requirements on all the modules are reduced.

In one embodiment, the control circuit further comprises: the protection module, the auxiliary source control module 103 is connected with the first control switch 105 through the protection module.

In one embodiment, the protection module is formed by a resistor or a plurality of resistors connected in series.

It should be noted that, as will be understood by those skilled in the art, in practical applications, the protection module may also adopt other circuit forms capable of playing a role of protecting the auxiliary source module 103, and the specific structure of the protection module is not limited in this embodiment.

It should be mentioned that, the auxiliary source control module 103 is connected to the first control switch 105 through the protection module, so that the situation that the auxiliary source control module 103 is damaged due to an excessive voltage input to the power input end of the auxiliary source control module 103 can be avoided.

A third embodiment of the present invention relates to a control circuit, which is substantially the same as the second embodiment, and is mainly distinguished by: in a third embodiment, the control circuit further comprises a switch control module, the first control switch being controlled by the switch control module.

Specifically, as shown in fig. 5, the control circuit includes: an auxiliary source module 101, a timing module 102, an auxiliary source control module 103, a sampling module 104, a first control switch 105, and a switch control module 106. The functions and connection relationships of the auxiliary source module 101, the timing module 102, the auxiliary source control module 103, the sampling module 104 and the first control switch 105 may refer to the related description of the second embodiment, and are not described herein again. In this embodiment, the switch control module 106 is configured to control on/off of the first control switch 105 based on a control signal and/or an external wake-up signal output by the main control module.

In one embodiment, a schematic diagram of the connections of the control circuitry, MSD, power cell and multimeter is shown in fig. 6. The first end of the auxiliary source module 101 is connected with the power battery 201, the second end of the auxiliary source module 101 is connected with the first end of the auxiliary source control module 103, the second end of the auxiliary source control module 103 is connected with the first end of the MSD module 202, the first end of the first control switch 105 is connected with the power battery 201, the second end of the first control switch 105 is respectively connected with the first end of the sampling module 104 and the power input end of the auxiliary source control module 103, the second end of the sampling module 104 is connected with the first end of the MSD module 202, and the second end of the MSD module 202 is connected with the power battery 201. The first control switch 105 is connected to a switch control module 106. The third terminal of the auxiliary source module 101 is connected to the timing module 102, and the fourth terminal of the auxiliary source module 101 is grounded. The auxiliary source module 101 converts a voltage between the first terminal of the auxiliary source module 101 and the second terminal of the auxiliary source module 101 into a supply voltage, and outputs the supply voltage from the third terminal of the auxiliary source module 101.

As can be seen from fig. 6, in the present embodiment, when the sampling module 104 is present in the control circuit, the sampling module 104 is connected to the power battery 201 via the first control switch 105. When the first control switch 105 is turned off, the branch where the sampling module 104 is located is turned off, the auxiliary source control module 103 has no power input, and the auxiliary source control module 103 is in a turned-off state. Therefore, when the power battery 201 needs to be overhauled, the first control switch 105 is disconnected, that is, the connection between the power battery 201 and the sampling module 104 and the connection between the power battery 201 and the power input end of the auxiliary source control module 103 can be disconnected, so that the two ends of the MSD module 202 are not electrified due to the existence of the branch where the sampling module 104 is located and the branch where the auxiliary source module 101 is located, and the abnormal electrification of the two ends of the MSD module 202 due to the frequently-hung branch in the control circuit during circuit overhaul is further reduced. In addition, the switch control module 106 controls the on/off of the first control switch 105 based on the control signal output by the main control module and/or the external wake-up signal, so that the first control switch 105 can be electrically controlled, and the operation and maintenance personnel can control the first control switch 105 more conveniently.

In one embodiment, the switch control module 106 includes: a first triode and a second triode; a first end of the first triode is used as a first external connection end of the switch control module 106 and is connected with a first end of the first control switch 105; a control end of the first triode is connected with a first end of the second triode, a node between the control end of the first triode and the first end of the second triode is used as a second external connection end of the switch control module 106 and a third external connection end of the switch control module 106, the second external connection end is connected with a second end of the first control switch 105, and the third external connection end is used for receiving an external wake-up signal; the second end of the first triode is grounded; the control end of the second triode is used as the fourth external connection end of the switch control module 106 and is used for receiving a control signal; the second end of the second triode is grounded; the first control switch 105 switches an operation state including an on state and an off state based on an electric signal of a first terminal of the first control switch 105 and an electric signal of a second terminal of the first control switch 105. Specifically, the first transistor and the second transistor change their states based on the electrical signal input from their control terminals, so as to control the voltage of the first terminal of the first control switch 105 and the voltage of the second terminal of the first control switch 105, and further change the operating state of the first control switch 105.

It should be noted that the external wake-up signal mentioned in this embodiment may be a low-voltage signal generated when an on-board DCDC converter needs to be externally connected to operate, for example, a signal generated when a charging gun of an electric vehicle is plugged into the electric vehicle, or a key ignition signal, and this embodiment does not limit the source of the external wake-up signal.

It should be noted that, as will be understood by those skilled in the art, the switch control module 106 may also adopt other circuit forms, or adopt a chip capable of implementing the function of the switch control module 106, and this embodiment is merely an example.

In one embodiment, the first control switch 105 may be an opto-coupler.

It should be noted that, as will be understood by those skilled in the art, in practical applications, the first control switch 105 may also adopt other devices that can switch the operating state based on the electrical signal of the first end of the first control switch 105 and the electrical signal of the second end of the first control switch 105, and this embodiment is merely an example.

The connection between the first control switch 105 and the switch control module 106 will be described below as an example.

For example, the first transistor and the second transistor in the switch control module 106 are both NPN transistors, the first control switch 105 is a photo coupler, and a schematic connection relationship between the first control switch 105 and the photo coupler is shown in fig. 7. Where U1 denotes the first control switch 105, T1 denotes the first transistor, and T2 denotes the second transistor. P1 represents the first termination of the switch control module 106, P2 represents the second termination of the switch control module 106, P3 represents the third termination of the switch control module 106, and P4 represents the fourth termination of the switch control module 106. When the external wake-up signal (high level signal) is input, no control signal or the control signal is a low level signal, T1 is driven to be turned on. When there is no external wake-up signal (high level signal), or the control signal is high level signal, the control terminal of T1 is low level, T1 is not conductive, and U1 is off.

A fourth embodiment of the present invention relates to a control circuit, which is substantially the same as the first embodiment, and is mainly distinguished by: in a fourth embodiment, the control circuit further includes a main control module, and the auxiliary source control module is controlled by the main control module.

Specifically, as shown in fig. 8, the control circuit further includes: a main control module 107. The main control module 107 is connected to the control end of the auxiliary source control module 103, and is configured to control the auxiliary source control module 103, so that the auxiliary source control module 103 controls the auxiliary source module 101 to stop outputting the power supply voltage to the timing module 102 when the power battery is overhauled.

As can be seen from fig. 8, the auxiliary source control module 103 is controlled by the main control module 107, and the main control module 107 can communicate with the outside. When the main control module 107 determines that the power battery needs to be overhauled currently, the auxiliary source control module 103 is controlled to control the auxiliary source module 101 to stop outputting the power supply voltage to the timing module 102. The auxiliary source control module 103 is controlled by the main control module 107, so that the auxiliary source control module 103 can be controlled externally.

It should be noted that, as can be understood by those skilled in the art, the main control module 107 may be a Micro Controller Unit (MCU), or may be another control Unit, and the present embodiment does not limit the device type of the main control module 107.

A fifth embodiment of the present invention relates to a control circuit, and is substantially the same as the first embodiment, and mainly differs therefrom in that: in the fifth embodiment, as shown in fig. 9, a schematic diagram of a control circuit includes: the device comprises an auxiliary source module 101, a timing module 102, an auxiliary source control module 103, a sampling module 104, a first control switch 105, a switch control module 106, a main control module 107 and a protection module 108.

Specifically, the schematic structural diagram of the control circuit is shown in fig. 9, and includes: the device comprises an auxiliary source module 101, a timing module 102, an auxiliary source control module 103, a sampling module 104, a first control switch 105, a switch control module 106, a main control module 107 and a protection module 108. The auxiliary source module 101 and the first control switch 105 are respectively connected with the positive electrode of the power battery, the switch control module 106 is connected with the first control switch 105 and used for controlling the working state of the first control switch 105, the first control switch 105 is connected with the sampling module 104, the first control switch 105 is connected with the power input end of the auxiliary source control module 103 through the protection module 108, the sampling module 104 is connected with the negative electrode of the power battery through the MSD module, the auxiliary source module 101 is connected with the negative electrode of the power battery through the auxiliary source control module 103 and the MSD module, and the auxiliary source module 101 is connected with the timing module 102. The main control module 107 is connected to the switch control module 106 and the auxiliary source control module 103, respectively. The functions of the modules may refer to the descriptions in the first to fourth embodiments, and are not described herein again.

In one embodiment, the auxiliary source module 101 uses a flyback circuit, the auxiliary source control module 103 includes a second control switch and an auxiliary source control component, the sampling module 104 is a high voltage sampling module, the first control switch 105 is a photocoupler, the switch control module 106 includes a first triode and a second triode, the main control module 107 is an MCU, and when the protection module 108 is composed of a resistor, the circuit connection diagram of the control circuit, the power battery, the MSD module and the power conversion module of the on-vehicle DCDC is as shown in fig. 10. Fig. 11 shows a schematic connection diagram of the on-vehicle DCDC converter 10, the power battery 201, the MSD module 202, and the multimeter 203, which are configured by the control circuit. In fig. 10, U1 denotes a first control switch 105, R1 denotes a first resistor, R2 denotes a second resistor, R1 and R2 constitute a sampling module 104, R3 denotes a third resistor, which is a protection module 108, T1 denotes a first triode, T2 denotes a second triode, MCU denotes a main control module 107, M1 denotes an auxiliary power control module, Q1 denotes a second control switch, which is an N-type transistor, M2 denotes an auxiliary power module 101, RTC denotes a timing module 102, VC denotes a power battery 201, MSD denotes an MSD module 202, M3 denotes a power conversion module, and vcc denotes a supply voltage output by the auxiliary power module 101. The power conversion module and the control circuit form a vehicle-mounted DCDC converter. When the vehicle-mounted DCDC converter is normally started, a circuit outside the vehicle-mounted DCDC converter generates an external wake-up signal, the external wake-up signal is input into T1 and drives T1 to be conducted, so that U1 is conducted, the power battery 201 drives the auxiliary source control module 103 to start working, the auxiliary source control module 103 controls the auxiliary source module 101 to start working and supplies power to the timing module 102 and the main control module 107 of the control circuit, and the main control module 107 controls the power conversion module to work, so that the vehicle-mounted DCDC starts to work normally. When the vehicle-mounted DCDC converter is in a sleep state, the external wake-up signal is switched off, the U1 is switched off, and at the moment, the power supply of the auxiliary source control component is provided by the auxiliary source module 101, so that the auxiliary source still works at the moment, the timing module 102 is powered, and the 24-hour monitoring function is guaranteed. When the vehicle-mounted DCDC converter does not work, no low-voltage wake-up signal is input, the U1 is disconnected, the main control module 107 receives an external instruction, determines that the vehicle-mounted DCDC converter needs to stop working, sends an electric signal to the auxiliary source control assembly, the auxiliary source control assembly controls the Q2 to be disconnected, and the auxiliary source module 101 stops working. At this time, the transistors in the U1, the Q1 and the power control module are all in an off state, the whole high-voltage loop has no path, and when the MSD module 202 is off, the multimeter cannot measure a stable high voltage at the two ends of the MSD module 202, so that the normal assembly of the power battery 201 is ensured. Under certain specific conditions, if required, when the on-board DCDC converter works normally, the main control module 107 may also control the T2 to close, and pull the control terminal of the T1 to ground, so as to disconnect the drive of the U1, and thus disconnect the U1.

In one example, the on-vehicle DCDC converter mentioned in the present embodiment is a 3 kilowatt (kW) on-vehicle DCDC converter having a 24-hour monitoring function. Fig. 12 is a schematic diagram showing a connection relationship between the on-vehicle DCDC converter and another circuit of the electric vehicle. As can be seen from fig. 12, the power battery 301 is connected to the BMS controller 302 to supply power to the BMS controller 302, the power battery 301 is connected to the Vehicle-mounted DCDC converter 304 through the fuse 303, the Vehicle-mounted DCDC converter 304 converts the voltage of the power battery 301 into a low voltage of 24V or 12V, and is respectively connected to the lead-acid battery 305, the Vehicle Control Unit (VCU) 306, the BMS controller 302, the MCU controller 307, and the other low voltage loads 308 of the entire Vehicle, the lead-acid battery 305 is respectively connected to the VCU controller 306 and the BMS controller 302 through the rocker switch S1, and the lead-acid battery 305 is respectively connected to the MCU controller 307 and the other low voltage loads 108 of the entire Vehicle through the rocker switch S1 and the power control switch S2 to supply power to the VCU controller 306, the BMS controller 302, the MCU controller 307, and the other low voltage loads 108. The power control switch S2 is connected to the VCU controller 306, and is controlled by the VCU controller 306 to switch between an on state and an off state. The communication terminal CAN of the VCU controller 306 is connected to the first communication terminal CAN1 of the BMS controller 302 to enable communication between the VCU controller 306 and the BMS controller 302, and the second communication terminal CAN2 of the BMS controller 302 is connected to the communication terminal CAN of the on-vehicle DCDC converter 304 to enable communication between the BMS controller 302 and the on-vehicle DCDC converter 304, so that the on-vehicle DCDC converter 304 CAN wake up the BMS controller 302 at regular time for battery monitoring. In the prior art, a low-voltage power supply architecture of an electric vehicle (also called a new energy vehicle) in the traditional bus market is limited by a vehicle system, and when the vehicle is powered off, normal power cannot be supplied to a BMS controller to realize a 24-hour monitoring function of a battery state. Therefore, a new 300 watt (W) DCDC converter operating for 24 hours needs to be added to the system to satisfy the 24 hour battery status monitoring function. The 3kW vehicle-mounted DCDC converter having the 24-hour monitoring function in the embodiment integrates the 24-hour monitoring function of the 300W DCDC converter operating for 24 hours, and the 3kW DCDC converter and the 300W DCDC converter operating for 24 hours are integrated into one, so that the 24-hour monitoring function of the battery state of the battery pack is realized, and the cost, the space and the complexity of the system of the whole vehicle are reduced.

It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.

Claims (10)

1. A control circuit, comprising:

the auxiliary source module is used for outputting power supply voltage for the timing module based on the high voltage of the power battery, and the power supply voltage is low voltage;

the timing module is powered on based on the input power supply voltage and is used for sending a wake-up signal to a dormant battery management system BMS at regular time according to preset time;

and the auxiliary source control module is used for controlling the auxiliary source module to stop outputting the power supply voltage to the timing module when the power battery is overhauled.

2. The control circuit of claim 1, further comprising: the power supply input end of the auxiliary source control module and the sampling module are respectively connected with the power battery through the first control switch;

the sampling module is used for sampling the electric signal of the power battery;

when the power battery is overhauled, the first control switch is switched to a disconnection state so as to disconnect the power battery from the sampling module and from the power input end of the auxiliary source control module.

3. The control circuit of claim 2, further comprising: a switch control module;

and the switch control module is used for controlling the on-off of the first control switch based on the control signal and/or the external wake-up signal output by the main control module.

4. The control circuit of claim 3, wherein the switch control module comprises: a first triode and a second triode;

the first end of the first triode is used as a first external connection end of the switch control module and is connected with the first end of the first control switch; the control end of the first triode is connected with the first end of the second triode, a node between the control end of the first triode and the first end of the second triode is used as a second external connection end of the switch control module and a third external connection end of the switch control module, the second external connection end is connected with the second end of the first control switch, and the third external connection end is used for receiving the external wake-up signal; the second end of the first triode is grounded; the control end of the second triode is used as a fourth external connection end of the switch control module and is used for receiving the control signal; the second end of the second triode is grounded;

the first control switch switches working states based on an electric signal of a first end of the first control switch and an electric signal of a second end of the first control switch, and the working states comprise a conducting state and a disconnecting state.

5. The control circuit of claim 4, wherein the first control switch is an opto-coupler.

6. The control circuit of claim 1, further comprising: a main control module;

the main control module is used for controlling the auxiliary source control module so as to control the auxiliary source control module to stop outputting the power supply voltage to the timing module when the power battery is overhauled.

7. The control circuit of any of claims 1-6, wherein the secondary source control module comprises: the auxiliary source module is connected with the power battery through the second control switch;

the auxiliary source control assembly is used for controlling the on-off of the second control switch;

and the second control switch is switched to a disconnection state when the power battery is overhauled so as to disconnect the connection between the auxiliary source module and the power battery.

8. The control circuit of claim 2, wherein a power input of the auxiliary source control module is connected to the auxiliary source module, and wherein the auxiliary source control module powers up based on the supply voltage and the power battery.

9. The control circuit of claim 2, further comprising: and the auxiliary source control module is connected with the first control switch through the protection module.

10. The control circuit according to any one of claims 1 to 6, wherein the circuit of the auxiliary source module is a flyback circuit.

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