CN116075999A - Power supply circuit, control method of power supply circuit and energy storage device - Google Patents
Power supply circuit, control method of power supply circuit and energy storage device Download PDFInfo
- Publication number
- CN116075999A CN116075999A CN202280005146.8A CN202280005146A CN116075999A CN 116075999 A CN116075999 A CN 116075999A CN 202280005146 A CN202280005146 A CN 202280005146A CN 116075999 A CN116075999 A CN 116075999A
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- switching tube
- current limiting
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
A power supply circuit comprises a main switch circuit, a pre-charge switch circuit, a current limiting circuit, an auxiliary source circuit and a control circuit; the input end of the main switch circuit and the input end of the pre-charging switch circuit are both connected with the output end of the power supply, and the output end of the main switch circuit is the output end of the power supply circuit; the output end of the pre-charging switch circuit is connected with the input end of the current limiting circuit, and the output end of the current limiting circuit is connected with the output end of the main switch circuit; the power end of the auxiliary source circuit is connected between the pre-charging switch circuit and the current limiting circuit; the output end of the auxiliary source circuit is connected with the output end of the control circuit; the output end of the control circuit is connected with the output end of the power supply circuit.
Description
Technical Field
The application relates to the technical field of circuit control, in particular to a power supply circuit, a control method of the power supply circuit and energy storage equipment.
Background
The statements herein merely provide background information related to the present application and may not necessarily constitute exemplary techniques.
In the power supply circuit of the related equipment, an auxiliary power supply circuit is generally used to call up part of the functional modules in the equipment and maintain the power supply of each functional module for a period of time when the power supply starts. After part of the functional modules work, the power supply circuit also performs pre-charging through the pre-charging circuit, and when the voltage of the output side of the pre-charging circuit is raised to the target voltage, the main power supply circuit supplies power to the equipment and closes the pre-charging circuit. Such a power supply circuit has many components and a control logic is complicated, which increases the circuit cost certainly.
Disclosure of Invention
According to various embodiments of the present application, a power supply circuit, a control method of the power supply circuit, and an energy storage device are provided.
The first aspect of the application provides a power supply circuit, which comprises a main switch circuit, a pre-charging switch circuit, a current limiting circuit, an auxiliary source circuit and a control circuit. The input end of the main switch circuit and the input end of the pre-charging switch circuit are both connected with the output end of the power supply, and the output end of the main switch circuit is the output end of the power supply circuit; the output end of the pre-charging switch circuit is connected with the input end of the current limiting circuit, and the output end of the current limiting circuit is connected with the output end of the main switch circuit. The power end of the auxiliary source circuit is connected between the pre-charge switch circuit and the current limiting circuit. The output end of the auxiliary source circuit is connected with the input end of the control circuit. The output end of the control circuit is connected with the output end of the power supply circuit. The precharge switching circuit is configured to be turned on when a precharge signal is received. The auxiliary source circuit is configured to start when the input voltage of the power supply terminal is larger than the enabling voltage, and output a starting voltage to the control circuit to start the control circuit after starting. The control circuit is configured to detect an output voltage of the power supply circuit after start-up, and to output a turn-on signal to the main switch circuit when it is detected that the output voltage rises to a precharge voltage threshold. The main switch circuit is configured to be turned on when receiving the on signal so that the power supply source supplies power through an output terminal of the power supply circuit.
The second aspect of the present application provides a control method of a power supply circuit, where the power supply circuit includes a main switch circuit, a pre-charge switch circuit, a current limiting circuit, an auxiliary source circuit, and a control circuit; the input end of the main switch circuit and the input end of the pre-charging switch circuit are both connected with the output end of the power supply, and the output end of the main switch circuit is the output end of the power supply circuit; the output end of the pre-charging switch circuit is connected with the input end of the current limiting circuit, and the output end of the current limiting circuit is connected with the output end of the main switch circuit; the power end of the auxiliary source circuit is connected between the pre-charging switch circuit and the current limiting circuit; the output end of the auxiliary source circuit is connected with the output end of the control circuit; the output end of the control circuit is connected with the output end of the power supply circuit; the precharge switching circuit is configured to be turned on when receiving a precharge signal; the auxiliary source circuit is configured to be started when the input voltage of the power supply end is larger than the enabling voltage, and outputs a starting voltage to the control circuit after the starting to start the control circuit; the control circuit is configured to execute a control method after start-up, the control method comprising:
detecting the output voltage of the output end of the power supply circuit;
outputting a turn-on signal to the main switching circuit when the rise of the output voltage to the precharge voltage threshold is detected; the turn-on signal is configured to turn on the main switching circuit such that the power supply supplies power through an output terminal of the power supply circuit.
A third aspect of the present application provides an energy storage device comprising a battery module and a power supply circuit as claimed in any one of the preceding claims.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are required for the embodiments will be briefly described, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of protection of the present application. Like elements are numbered alike in the various figures.
Fig. 1 is a functional block diagram of a power supply circuit according to an embodiment of the present application.
Fig. 2 is a partial circuit diagram of a power supply circuit according to an embodiment of the present application.
Fig. 3 is a partial circuit diagram of a power supply circuit according to an embodiment of the present application.
Fig. 4 is a functional block diagram of an energy storage device according to an embodiment of the present application.
Fig. 5 is a flowchart illustrating a control method of a power supply circuit according to an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.
It is noted that when one component is considered to be "connected" to another component, it may be directly connected to the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Some embodiments will be described below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
In the power supply circuit of the related equipment, an auxiliary power supply circuit is generally used to call up part of the functional modules in the equipment and maintain the power supply of each functional module for a period of time when the power supply starts. After part of the functional modules work, the power supply circuit also performs pre-charging through the pre-charging circuit, so that when the voltage of the output side of the pre-charging circuit is raised to the target voltage, the main power supply circuit supplies power to the equipment, and the pre-charging circuit is closed. That is, the auxiliary power supply circuit and the precharge circuit are provided with different drivers to realize the power supply process of the whole equipment, so that the power supply circuit has more components and more control logic, which obviously increases the circuit cost.
Therefore, the present application provides a power supply circuit 200, referring to fig. 1, with a simpler circuit structure and control logic, which can effectively reduce the manufacturing cost.
In some embodiments, referring to fig. 1, the power supply circuit 200 includes a main switch circuit 210, a pre-charge switch circuit 220, a current limiting circuit 230, an auxiliary source circuit 240, and a control circuit 250. The main switch circuit 210 is connected between the power supply and the output terminal OUT of the power supply circuit 200. The power supply can be energy storage equipment or electronic equipment with an external power supply function, such as air conditioner with a power pack, a mobile trolley, a mower and other electronic equipment.
The input terminal of the main switch circuit 210 and the input terminal of the pre-charge switch circuit 220 are both connected to the output terminal of the power supply, and the output terminal of the main switch circuit 210 is the output terminal OUT of the power supply. An output terminal of the precharge switching circuit 220 is connected to an input terminal of the current limiting circuit 230, and an output terminal of the current limiting circuit 230 is connected to an output terminal of the main switching circuit. The power source PW of the auxiliary source circuit 240 is connected between the precharge switching circuit 220 and the current limiting circuit 230. An output of the auxiliary source circuit 240 is connected to an output of the control circuit 250. An output terminal of the control circuit 250 is connected to an output terminal OUT of the power supply circuit 200.
Specifically, the precharge switching circuit 220 is configured to be turned on when receiving the precharge signal, so that after the power supply is connected, the power supply can be output through the current limiting of the current limiting circuit 230, so that the voltage of the output terminal OUT of the power supply circuit 200 rises. Meanwhile, after the precharge switch circuit 220 is turned on, the power supply may also be output to the power supply end PW of the auxiliary source circuit 240 after passing through the precharge switch circuit 220, so as to supply power to the auxiliary source circuit 240, so as to wake up the auxiliary source circuit 240, and further wake up the control circuit 250 by the auxiliary source circuit 240.
The precharge signal may be input from an external circuit connected to the precharge switching circuit 220, or may be input from the chip to the precharge switching circuit 220 according to a preset control logic, which is not limited herein.
After the precharge switching circuit 220 is turned on, the auxiliary source circuit 240 is configured to start when the voltage of the power supply terminal PW of the auxiliary source circuit 240 is greater than the enable voltage, and output a start voltage to the control circuit 250 after starting.
For example, the voltage of the power supply is 12V, when the precharge switch circuit 220 is turned on, since the voltage drop across the precharge switch circuit 220 is small, the input voltage of the power supply terminal PW of the auxiliary circuit 240 is approximately 12V, and if the enabling voltage of the auxiliary circuit 240 is 10V, the auxiliary circuit 240 will be started, and after restarting, the starting voltage (for example, 3.3V) is output to the control circuit 250 to wake up the control circuit 250. In this embodiment, the power supply can be output to the power source PW of the auxiliary source circuit 240 only through the precharge switch circuit 220, so that the auxiliary source circuit 240 can be timely powered after the precharge switch circuit 220 is turned on, thereby starting the control circuit 250.
The control circuit 250 is configured to detect an output voltage of the output terminal OUT of the power supply circuit 200 after the start-up, and output a turn-on signal to the main switch circuit 210 when detecting that the output voltage rises to a precharge voltage threshold value within a preset period of time.
The control circuit 250 may include a control chip and some peripheral circuits, among others. The peripheral circuit includes a voltage detection circuit for detecting an output voltage of the output terminal OUT of the power supply circuit 200, and the control chip obtains the output voltage detected by the voltage detection circuit and outputs or does not output a turn-on signal to the main switch circuit 210 according to a preset control logic.
The main switch circuit 210 is configured to be turned on when receiving the on signal, so that the power supply supplies power to the connected load through the output terminal of the power supply circuit 200. In this embodiment, the power supply end of the auxiliary source circuit 240 is directly connected between the pre-charge switch circuit 220 and the current limiting circuit 230, so that the auxiliary source circuit 240 directly wakes up the control circuit 250 after the pre-charge switch circuit 220 is turned on, and a corresponding driving circuit is not required to be arranged for the auxiliary source circuit 240, thereby simplifying the circuit and the circuit control logic, and reducing the manufacturing cost of the circuit. Meanwhile, the pre-charging switch circuit 220 is turned on to enable the power supply to provide voltage to the output terminal OUT of the power supply circuit 200 through the current limiting circuit 230, so that the output terminal OUT of the power supply circuit 200 is pre-charged, and when the voltage of the output terminal OUT of the power supply circuit 200 is raised to the pre-charging voltage threshold value, the control circuit 250 can directly turn on the main switch circuit 210, thereby switching into a normal power supply state from the pre-charging state without more complex driving control. In addition, in the present embodiment, the impedance of the main switch circuit 210 after being turned on is smaller, so that when the main switch circuit 210 is in a normal state, the pre-charge switch circuit 220 and the current limiting circuit 230 can be bypassed, thereby avoiding the power loss caused by the current limiting circuit 230 being in a working state all the time. In addition, since the main switch circuit 210 is simply bypassed when it is turned on, when the main switch circuit 210 is abnormally turned off, the power supply can still be rapidly switched to the pre-charge switch circuit 220 to supply power to the output terminal OUT of the power supply circuit 200 and to the auxiliary source circuit 240 because the pre-charge switch circuit 220 is still in the on state, thereby ensuring that the circuit can work normally and improving the stability of the circuit.
In some embodiments, referring to fig. 1, the power supply circuit 200 further includes a driving circuit 260. The driving circuit 260 is electrically connected to the precharge switching circuit 220. The driving circuit 260 is configured to receive the pre-charge signal, level-convert the pre-charge signal, and output the level-converted pre-charge signal to the pre-charge switch circuit 220, so as to drive the pre-charge switch circuit 220 to be turned on.
The driving circuit 260 is configured to perform level conversion on the pre-charge signal, for example, amplify the pre-charge signal, and output the amplified pre-charge signal to the pre-charge switch circuit 220. The driving circuit 260 may be designed according to actual circuit requirements. In an embodiment, the driving circuit may be designed as a photoelectric coupling type or a magnetic coupling type driving circuit, which is not particularly limited herein. In some embodiments, referring to fig. 2, fig. 2 is a partial circuit diagram of a power supply circuit 200 according to another embodiment of the present application. The specific circuit structure of the precharge switching circuit 220 of the power supply circuit 200 may refer to the precharge switching circuit 220 in fig. 2. In some embodiments, the precharge switching circuit 220 includes a first switching transistor Q1, a second switching transistor Q2, and a voltage dividing resistor R1.
The first end of the first switching tube Q1 is connected to the power supply VCC, and the second end of the first switching tube Q1 is connected to the second end of the second switching tube Q2. The first end of the second switching tube Q2 is connected to the current limiting circuit 230. The control end of the first switching tube Q1 is connected with the control end of the second switching tube Q2. The voltage dividing resistor R1 is connected between the first end and the control end of the first switching tube Q1. In this way, the control ends of the first switching tube Q1 and the second switching tube Q2 are configured to receive the pre-charge signal EN1 after the level conversion of the driving circuit 260, and conduct when receiving the pre-charge signal EN1, so as to output the electric energy output by the power supply to the power supply ends PW of the current limiting circuit 230 and the auxiliary source circuit 240. The first switching tube Q1 and the second switching tube Q2 are in an off state when the precharge signal EN1 is not received.
In some embodiments, the first switching transistor Q1 and the second switching transistor Q2 may be Metal-Oxide-semiconductor-field effect transistors (MOSFETs) or insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBTs). When the first switching tube Q1 and the second switching tube Q2 are P-type MOSFETs, the first ends of the first switching tube Q1 and the second switching tube Q2 are drain electrodes, the second ends of the first switching tube Q1 and the second switching tube Q2 are source electrodes, and the control ends of the first switching tube Q1 and the second switching tube Q2 are gate electrodes.
When the first switching tube Q1 and the second switching tube Q2 are P-type MOSFETs, the pre-charge signal EN1 received by the driving circuit 260 is at a high level, and after the pre-charge signal is converted into a low-level pre-charge signal, the first switching tube Q1 and the second switching tube Q2 are turned on simultaneously, so as to output the electric energy output by the power supply to the power supply end PW of the current limiting circuit 230 and the auxiliary circuit 240 (not shown, see fig. 1).
In some embodiments, the first switching tube Q1 and the second switching tube Q2 are P-type MOSFETs, and the first switching tube Q1 includes a parasitic diode D1, and the second switching tube Q2 includes a parasitic diode D2. The positive electrode of the parasitic diode D1 is connected to the drain electrode of the first switching tube Q1, and the negative electrode of the parasitic diode D1 is connected to the source electrode of the first switching tube Q1. The positive electrode of the parasitic diode D2 is connected to the drain electrode of the second switching tube Q2, and the negative electrode of the parasitic diode D2 is connected to the source electrode of the second switching tube Q2.
In some embodiments, please continue to refer to fig. 2, the specific circuit structure of the main switch circuit 210 of the power supply circuit 200 may refer to fig. 2. The main switching circuit 210 includes a third switching tube Q3, a fourth switching tube Q4, a first current limiting resistor R2, a first bias resistor R3, a second current limiting resistor R4, and a second bias resistor R5.
Wherein, the first end of the third switching tube Q3 is connected with the first end of the fourth switching tube Q4. The second end of the third switching tube Q3 is connected to the power supply VCC. The control end of the third switching tube Q3 is connected with the first end of the first current limiting resistor R2. The second terminal of the first current limiting resistor R2 is connected to the control circuit 250 (not shown, refer to fig. 1) to receive the on signal EN2 output by the control circuit 250. The first end of the first bias resistor R3 is connected with the second end of the first current limiting resistor R2, and the second end of the first bias resistor R3 is connected with the second end of the third switching tube Q3. The second terminal of the fourth switching tube Q4 is connected to the output terminal OUT of the power supply circuit 200. The control end of the fourth switching tube Q4 is connected with the first end of the second current limiting resistor R4. A second terminal of the second current limiting resistor R4 is connected to a control circuit 250 (not shown, see fig. 1). The first end of the second bias resistor R5 is connected to the second end of the second current limiting resistor R4. The second end of the second bias resistor R5 is connected with the second end of the fourth switching tube Q4.
The second terminal of the first current limiting resistor R2 and the second terminal of the second current limiting resistor R4 are configured to receive the on signal EN2 output by the control circuit 250 (not shown, refer to fig. 1). In this way, the third and fourth switching transistors Q3 and Q4 are turned on upon receiving the on signal EN2, so that the power supply VCC supplies power through the output terminal OUT of the power supply circuit 200.
In some embodiments, the third switching transistor Q3 and the fourth switching transistor Q4 may be Metal-Oxide-semiconductor-field effect transistors (MOSFETs) or insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBTs). When the third switching tube Q3 and the fourth switching tube Q4 are N-type MOSFETs, the first ends of the third switching tube Q3 and the fourth switching tube Q4 are drain electrodes, the second ends of the third switching tube Q3 and the fourth switching tube Q4 are source electrodes, and the control ends of the third switching tube Q3 and the fourth switching tube Q4 are gate electrodes.
In some embodiments, the third and fourth switching transistors Q3 and Q4 are N-type MOSFETs, and the third and fourth switching transistors Q3 and Q4 include parasitic diodes D3 and D4, respectively. The positive electrode of the parasitic diode D3 is connected to the source electrode of the third switching tube Q3, and the negative electrode of the parasitic diode D3 is connected to the drain electrode of the third switching tube Q3. The positive electrode of the parasitic diode D4 is connected to the source electrode of the fourth switching tube Q4, and the negative electrode of the parasitic diode D4 is connected to the drain electrode of the fourth switching tube Q4.
In some embodiments, the specific circuit structure of current limiting circuit 230 of power supply circuit 200 may refer to the circuit structure in fig. 2. In some embodiments, current limiting circuit 230 includes a third current limiting resistor R6. The third current limiting resistor R6 is connected between the pre-charging switch circuit 220 and the output terminal OUT of the power supply circuit 200, and is used for limiting the magnitude of the current output from the pre-charging switch circuit 220 to the output terminal OUT of the power supply circuit 200, so as to reduce the risk of damaging the circuit due to high current and realize pre-charging of the output terminal of the power supply circuit. The specific circuit structure in the current limiting circuit 230 is not limited in the present application, and the current limiting circuit 230 can be adjusted accordingly according to specific requirements, so as to achieve the purpose of current limiting protection. In other embodiments, a plurality of resistors may be connected in series to the current limiting circuit 230.
In other embodiments, power supply circuit 200 further includes a first protection circuit. In some embodiments, a first protection circuit is connected in series with the branch in which the current limiting circuit 230 is located to open the branch when the branch is over-current or short-circuited, thereby reducing the risk of damaging the circuit by over-current or short-circuiting. In some embodiments, the first protection circuit includes a fuse F1, as shown in FIG. 2.
In some embodiments, power supply circuit 200 also includes a second protection circuit. The second protection circuit 280 is electrically connected between the power supply VCC and the main switch circuit 210. The second protection circuit is used to be opened when the current output by the power supply VCC is excessive or short-circuited, thereby reducing the risk of damaging the main switching circuit 210 due to the excessive current or short-circuit. In some embodiments, the second protection circuit includes a fuse F2, as shown in fig. 2.
It will be appreciated that in other embodiments, the first protection circuit and the second protection circuit may be other circuits with an overcurrent protection or a short-circuit protection function, and the specific circuit structures of the first protection circuit and the second protection circuit are not limited in this application.
In some embodiments, power supply circuit 200 also includes an anti-reflection circuit. The input of the anti-reflection circuit is connected to the precharge switching circuit 220. The output of the anti-reflection circuit is connected to the power source PW of the auxiliary source circuit 240 (not shown, refer to fig. 1). The anti-reverse circuit is used for preventing the power on the auxiliary source circuit 240 from flowing backward to the power supply VCC side or the output terminal OUT, so as to damage the power supply VCC or cause the fluctuation of the output terminal voltage.
In some embodiments, the anti-reflection circuit includes a diode D5. The positive circuit of the diode D5 is connected to the precharge switch circuit 220, and the negative circuit of the diode D5 is connected to the power supply terminal PW of the auxiliary source circuit 240 (not shown, see fig. 1).
In some embodiments, the specific circuit structure of the driving circuit 260 of the power supply circuit 200 may refer to the circuit structure of the driving circuit 260 in fig. 2. In some embodiments, the driving circuit 260 includes a driving switch tube Q5, a fourth current limiting resistor R7, a fifth current limiting resistor R8, and a driving voltage dividing resistor R9. The first end circuit of the fourth current limiting resistor R7 is connected to the voltage dividing resistor R1 of the precharge switching circuit 220, and the second end circuit of the fourth current limiting resistor R7 is connected to the first end of the driving switching tube Q5. The first end circuit of the fifth current limiting resistor R8 is connected to the control end of the driving switch tube Q5. The second end of the fifth current limiting resistor R8 is configured to receive the precharge signal EN1. The first end circuit of the driving voltage dividing resistor R9 is connected to the control end of the switching tube Q5. The second terminal of the driving voltage dividing resistor R9 is grounded. The second end circuit of the driving switch tube Q5 is connected to the second end of the driving voltage dividing resistor R9.
In some embodiments, the driving switch Q5 is a triode. The first end of the driving switch tube Q5 is a collector, the control end is a base, and the third end is an emitter.
The following describes the working principle of the power supply circuit 200 provided in the present application with reference to fig. 1 and 2, taking a circuit diagram of the power supply circuit 200 shown in fig. 2 as an example:
when the driving circuit 260 receives the high-level pre-charge signal EN1, the driving circuit 260 performs level conversion on the pre-charge signal EN1, and outputs a corresponding driving signal to the pre-charge switch circuit 220, and the pre-charge switch circuit 220 is turned on after receiving the driving signal corresponding to the pre-charge signal EN1, so that the power supply VCC outputs a voltage to the output terminal OUT of the power supply circuit 200 through the pre-charge switch circuit 220 and the current limiting circuit 230, so that the voltage of the output terminal OUT of the power supply circuit 200 rises. Meanwhile, the power supply VCC also outputs a voltage to the auxiliary source circuit 240 through the precharge switch circuit 220, so that the auxiliary source circuit 240 supplies power to the control circuit 250.
The control circuit 250 starts operation after receiving the voltage output from the auxiliary source circuit 240, and detects the output voltage of the output terminal OUT of the power supply circuit. When the control circuit 250 detects that the voltage of the output terminal OUT of the power supply VCC rises to the precharge voltage threshold, it outputs a turn-on signal to the main switch circuit 210. In another embodiment, the control circuit 250 may output the turn-on signal to the main switch circuit 210 only when detecting that the voltage of the output terminal OUT rises to the precharge voltage threshold value within the preset precharge period, and output the early warning information if the voltage does not reach the precharge voltage threshold value within the preset precharge period. The preset pre-charging time period refers to a pre-charging time period preset according to actual practice, if the voltage is not raised to the preset voltage threshold value yet after the preset pre-charging time period is exceeded, the fault is indicated to exist in the circuit, so that fault early warning is needed, and meanwhile, a turn-off signal can be further output to turn off the pre-charging switch circuit 220.
The main switch circuit 210 is configured to be turned on when receiving the on signal, so that the power supply VCC supplies power through the output terminal OUT of the power supply circuit 200.
It will be appreciated that in some embodiments, the control circuit 250 and the load connected to the output terminal OUT of the power supply circuit 200 may be simultaneously powered after the main switch circuit 210 is turned on.
The traditional power supply loop is complex, a single independent loop needs to be arranged, namely a pre-charging loop, an auxiliary source loop and a main switch loop, more loop components are needed, the cost of the circuit is increased, a plurality of loops are controlled, the control logic is complex, and codes are not easy to iterate. In the above, the power supply circuit 200 provided in the present application can be used to supply power to an external system and an internal control circuit by the power supply VCC. In one or more embodiments, the power supply circuit 200 also has a simpler circuit structure and simpler control logic, so that the circuit cost can be further reduced and the iteration of the control code is facilitated.
In other embodiments, the control circuit 250 is further configured to control the precharge switching circuit 220 to maintain the open state when the detected output voltage is less than the reference voltage threshold for a predetermined period of time. The reference voltage threshold is smaller than the precharge voltage threshold, and the preset duration is smaller than the preset precharge duration. The preset duration may be set to a short period of time to ensure that anomalies are detected and responded to quickly during the start-up process.
In other embodiments, when the control circuit 250 detects that the output voltage is greater than or equal to the reference voltage threshold for the preset time period, the control circuit controls the precharge switching circuit 220 to maintain the on state, and further determines whether the output voltage can be raised to the precharge voltage threshold when the precharge time period is reached. This process keeps the precharge switching circuit 220 in an on state.
It is to be understood that the specific circuit configuration in power supply circuit 200 is not limited by the present application. For example, referring to fig. 3, fig. 3 is a partial circuit diagram of a power supply circuit 200 according to another embodiment of the present application. In other embodiments, according to fig. 3, a part of the circuit in fig. 2 may be replaced by a corresponding circuit structure.
For example, in some embodiments, the specific circuit structure of the precharge switching circuit 220 of the power supply circuit 200 may refer to the precharge switching circuit 220 in fig. 3. In some embodiments, the precharge switching circuit 220 includes a fifth switching tube Q6, a third bias resistor R10, and a first filter capacitor C1. The first end of the fifth switching tube Q6 is used for being connected with a power supply. The second end of the fifth switching tube Q6 is connected to the current limiting circuit 230. The control end of the fifth switch Q6 is configured to receive a precharge signal, so as to be turned on when the precharge signal is received. The third bias resistor R10 and the first filter capacitor C1 are connected in parallel, and then connected between the first end and the control end of the fifth switching tube Q6.
The first filter capacitor C1 and the third bias resistor R10 form an RC filter circuit, and are used for filtering the electric signal input to the pre-charging switch circuit 220 by the power supply VCC, so as to prevent the fifth switch tube Q6 from being damaged by the excessive voltage.
In some embodiments, when the fifth switching transistor Q6 is a P-type MOSFET, the first terminal of the fifth switching transistor Q6 is a source, the second terminal is a drain, and the control terminal is a gate. In some embodiments, when the fifth switching tube Q6 is a P-type MOSFET, the fifth switching tube Q6 further includes a parasitic diode D6, where an anode of the parasitic diode D6 is connected to a drain of the P-type MOSFET, and a cathode of the parasitic diode D6 is connected to a source of the P-type MOSFET.
In some embodiments, the precharge switching circuit 220 further includes a zener diode D7. The cathode of the zener diode D7 is connected to the first end of the fifth switching tube Q6. The positive pole of the zener diode D7 is connected to the control terminal of the fifth switching tube Q6. The zener diode D7 is used to stabilize the voltage difference between the first terminal and the control terminal of the fifth switching transistor Q6. When the voltage input by the power supply is greater than or equal to the preset voltage of the zener diode D7, the zener diode D7 breaks down, and no current flows through the fifth switching tube Q6, that is, the fifth switching tube Q6 is not damaged.
In some embodiments, referring to fig. 3, the power supply circuit 200 shown in fig. 3, when the power supply circuit 200 further includes a driving circuit 260. The driving circuit 260 includes a driving switch Q5, a fourth current limiting resistor R7, a fifth current limiting resistor R8 and a driving voltage dividing resistor R9, and the connection modes of the driving switch Q5, the fourth current limiting resistor R7, the fifth current limiting resistor R8 and the driving voltage dividing resistor R9 are described in the above embodiments, when the pre-charging circuit 220 includes a zener diode D7, a first end of the fourth current limiting resistor R7 in the driving circuit 260 is connected to an anode of the zener diode D7, and the effect of the zener diode D7 will be described in conjunction with the driving circuit 260.
Specifically, when the driving switching transistor Q5 is turned on, the fourth current limiting resistor R7 in the driving circuit 260 is grounded. Because the driving switch Q5 is a PMOS transistor, and the control end of the driving switch Q5 is connected to the fourth current limiting resistor R7 of the driving circuit 26 through the zener diode D7, at this time, the driving switch Q5 is turned on, and the positive electrode of the zener diode D7 is equivalent to the ground. In this way, when the voltage of the power supply VCC is greater than the regulated voltage of the zener diode D6, the zener diode D7 breaks down, thereby protecting the fifth switching tube Q6 and reducing the risk of the pin of the fifth switching tube Q6 being damaged by the instantaneous voltage of the power supply VCC.
In some embodiments, the pre-charge switch circuit 220 includes at least one second filter capacitor for absorbing the peak voltage outputted from the power supply VCC. When the precharge switching circuit 220 includes only one second filter capacitor, for example, the filter capacitor C2, one end of the filter capacitor C2 is connected to the first end of the fifth switching tube Q6. The other end of the filter capacitor C2 is connected with the second end of the fifth switching tube Q6. When the precharge switch circuit 220 includes a plurality of second filter capacitors (e.g., the filter capacitor C2 and the filter capacitor C3), the plurality of second filter capacitors are connected in series (i.e., the filter capacitor C2 and the filter capacitor C3 are connected in series). And one ends of the plurality of second filter capacitors connected in series are connected with the first ends of the fifth switch tubes Q6. The other ends of the plurality of second filter capacitors connected in series are connected with the second end of the fifth switching tube Q6.
In some embodiments, the specific circuit structure of current limiting circuit 230 of power supply circuit 200 may refer to the circuit structure of current limiting circuit 230 in fig. 3. In some embodiments, the current limiting circuit 230 includes a number of current limiting resistors connected in parallel, such as current limiting resistor R14, current limiting resistor R15, and current limiting resistor R16 connected in parallel. It is understood that the number of parallel current limiting resistors in the current limiting circuit 230 is not limited in this application, and those skilled in the art can adjust the number according to the actual circuit requirement. With continued reference to fig. 3, in some embodiments, an anti-reflection circuit is also disposed between the current limiting circuit 230 and the output terminal OUT of the power supply circuit 200, and the anti-reflection circuit may include an anti-reflection diode D8 as shown in fig. 3, the anode of the anti-reflection diode D8 is connected to the second end of the current limiting circuit 230, and the cathode of the anti-reflection diode D8 is connected to the output end OUT of the power supply circuit 200. Thus, the load connected to the output terminal OUT of the power supply circuit 200 can be prevented from damaging the power supply circuit 200 due to excessive voltage at the moment of power-on.
In some embodiments, a third protection circuit is further connected between the anti-reflection circuit and the power source PW of the auxiliary source circuit 240 (not shown, see fig. 1). The circuit structure of the third protection circuit may be the same as that of the first protection circuit, i.e., the third protection circuit may include a fuse F3 as shown in fig. 3. In this way, the risk of damaging the circuit due to overcurrent or short-circuiting can be reduced.
It will be appreciated that the power supply circuit 200 shown in fig. 3 also includes a main switching circuit. In some embodiments, the circuit structure of the main switch circuit in the power supply circuit 200 shown in fig. 3 can refer to the main switch circuit 210 (please refer to fig. 2), and will not be described herein.
With continued reference to fig. 4, an embodiment of the present application further provides an energy storage device. The energy storage device includes a battery module 300 and a power supply circuit 200 connected in circuit. The output terminal OUT of the power supply circuit 200 is connected to the load 100 to transmit the power of the energy storage battery module 300 to the load 100. It will be appreciated that the output OUT of the power supply circuit 200 may also be connected to other operating modules within the energy storage device to provide the other operating modules with the voltages required for operation.
It is to be understood that the energy storage devices referred to herein include, but are not limited to, primary batteries, secondary batteries, fuel cells, solar cells, and the like, any device that can be used to store energy. The load 100 may be an electric motorcycle, an electric bicycle, an electric automobile, a mobile phone, a tablet computer, a digital assistant, a personal computer, or any other suitable electric equipment, or the load 100 may be at least one of a motor unit, a display unit, a wireless fidelity (Wireless Fidelity, wiFi) unit, a bluetooth unit, a speaker, and other power consumption devices in the electric equipment, which are not described herein again.
With continued reference to fig. 5, an embodiment of the present application further provides a control method of a power supply circuit, which can be used to control the power supply circuit in any of the foregoing embodiments. For a specific structure of the power supply circuit, reference may be made to the structure in the previous embodiment.
This control method can be used to control the power supply circuit 200 mentioned in the above embodiment. Specifically, the control method is applied to the control circuit 250 in the power supply circuit 200.
In some embodiments, the control method includes:
step S110: and obtaining the output voltage of the output end of the power supply circuit.
When the power supply circuit is started, that is, the pre-charge switch circuit 220 is turned on, and after the pre-charge switch circuit 220 is turned on, the power supply outputs a voltage to the output end of the power supply circuit through the pre-charge switch circuit 220 and the current limiting circuit 230, and the power supply also outputs a voltage to the auxiliary source circuit through the pre-charge switch circuit 210, so as to start the control circuit 250. The control circuit 250 may sample the output voltage of the power supply circuit output directly through the sampling terminal or through the voltage sampling circuit.
Step S120: when the output voltage rises to the precharge voltage threshold, a turn-on signal is output to the main switching circuit. The on signal is used to turn on the main switch circuit 210 so that the power supply supplies power through the output terminal of the power supply circuit.
When the output voltage rises to the precharge voltage threshold, it can be confirmed that precharge is currently completed, and a turn-on signal is output to the main switch unit, so that the main switch unit is turned on, and the entire power supply circuit is brought into a normal power supply state. In this embodiment, the precharge switching circuit is turned on first and then the main switching circuit is turned on after the precharge is completed, so that more complex control driving logic is not needed, and the method is simple and easy to implement.
It is understood that the steps mentioned in the control method above are performed.
The control method further includes outputting a turn-on signal to the main switch circuit 210 when the output voltage is detected to rise to the precharge voltage threshold within a preset precharge period. And if the preset precharge time period does not reach the precharge voltage threshold value, outputting the early warning information. The preset pre-charging time period refers to a pre-charging time period preset according to actual practice, if the voltage is not raised to the preset voltage threshold value yet after the preset pre-charging time period is exceeded, the fault is indicated to exist in the circuit, so that fault early warning is needed, and meanwhile, a turn-off signal can be further output to turn off the pre-charging switch circuit 220.
The method further comprises the following steps: when the preset duration detection output voltage is less than the reference voltage threshold, the precharge switching circuit 220 is controlled to maintain the off state. The reference voltage threshold is smaller than the precharge voltage threshold, and the preset duration is smaller than the preset precharge duration. The preset duration may be set to a short period of time to ensure that anomalies are detected and responded to quickly during the start-up process. In general, during the pre-charging process, the output voltage at the output end of the power supply circuit will exhibit a slow rising process, and if the rising process is not detected for a certain period of time, that is, the detected output voltage is less than the reference voltage threshold for a preset period of time, it can be confirmed that there is an abnormality in the output voltage. By performing abnormality judgment before the pre-charging is completed, faults can be found in time, and the safety and stability of the circuit are ensured.
In other embodiments, when the control circuit 250 detects that the output voltage is greater than or equal to the reference voltage threshold for the preset time period, the control circuit controls the precharge switching circuit 220 to maintain the on state, and further determines whether the output voltage can be raised to the precharge voltage threshold when the precharge time period is reached. This process keeps the precharge switching circuit 220 in an on state.
In some embodiments, a detection apparatus is provided, the detection apparatus comprising: the detection device is configured to detect the output voltage of the output end of the power supply circuit after starting. The control module is configured to output a turn-on signal to the main switching circuit upon detecting an increase in the output voltage to a precharge voltage threshold. The on signal is used for conducting the main switch circuit so that the power supply supplies power through the output end of the power supply circuit.
In addition, those of ordinary skill in the art will recognize that the above embodiments are presented for purposes of illustration only and are not intended to be limiting, and that suitable modifications and variations of the above embodiments are within the scope of the disclosure of the present application.
Claims (11)
1. The power supply circuit comprises a main switch circuit, a pre-charge switch circuit, a current limiting circuit, an auxiliary source circuit and a control circuit; the input end of the main switch circuit and the input end of the pre-charging switch circuit are both connected with the output end of the power supply, and the output end of the main switch circuit is the output end of the power supply circuit; the output end of the pre-charging switch circuit is connected with the input end of the current limiting circuit, and the output end of the current limiting circuit is connected with the output end of the main switch circuit; the power end of the auxiliary source circuit is connected between the pre-charging switch circuit and the current limiting circuit; the output end of the auxiliary source circuit is connected with the input end of the control circuit; the output end of the control circuit is connected with the output end of the power supply circuit;
the precharge switching circuit is configured to turn on when receiving a precharge signal; the auxiliary source circuit is configured to be started when the input voltage of the power supply end is larger than the enabling voltage, and output a starting voltage to the control circuit after starting so as to start the control circuit; the control circuit is configured to detect an output voltage of the power supply circuit after starting, and output a conduction signal to the main switch circuit when the output voltage is detected to rise to a precharge voltage threshold value; the main switch circuit is configured to be turned on when the on signal is received, so that the power supply source supplies power through an output end of the power supply circuit.
2. The power supply circuit of claim 1, wherein the power supply circuit further comprises a drive circuit;
the driving circuit is connected with the pre-charging switch circuit, and is configured to receive the pre-charging signal, level-convert the pre-charging signal and output the pre-charging signal to the pre-charging switch circuit so as to drive the pre-charging switch circuit to be conducted.
3. The power supply circuit of claim 1, wherein the pre-charge switching circuit comprises a first switching tube, a second switching tube, and a voltage dividing resistor;
the first end of the first switching tube is connected with the power supply, the second end of the first switching tube is connected with the second end of the second switching tube, the first end of the second switching tube is connected with the current limiting circuit, and the voltage dividing resistor is connected between the first end and the control end of the first switching tube; the control end of the first switching tube is connected with the control end of the second switching tube so as to receive the pre-charging signal and conduct when the pre-charging signal is received.
4. The power supply circuit of any one of claim 1, wherein the main switching circuit comprises a third switching tube, a fourth switching tube, a first bias resistor, a first current limiting resistor, a second bias resistor, and a second current limiting resistor;
the first end of the third switching tube is connected with the first end of the fourth switching tube, the second end of the third switching tube is used for being connected with the power supply, the control end of the third switching tube is connected with the first end of the first current limiting resistor, the second end of the first current limiting resistor is connected with the control circuit, the first end of the first bias resistor is connected with the second end of the first current limiting resistor, and the second end of the first bias resistor is connected with the second end of the third switching tube;
the second end of the fourth switching tube is connected with the output end of the power supply circuit, the control end of the fourth switching tube is connected with the first end of the second current limiting resistor, the second end of the second current limiting resistor is connected with the control circuit, the first end of the second bias resistor is connected with the second end of the second current limiting resistor, and the second end of the second bias resistor is connected with the second end of the fourth switching tube.
5. The power supply circuit of claim 1, further comprising an anti-reflection circuit, wherein an input of the anti-reflection circuit is connected to the pre-charge switch circuit, and an output of the anti-reflection circuit is connected to a power supply of the auxiliary source circuit.
6. The power supply circuit of claim 1, wherein the power supply circuit further comprises a protection circuit; the protection circuit is connected in series with the branch circuit where the current limiting circuit is located, so as to disconnect the branch circuit when the branch circuit is over-current or short-circuited.
7. The power supply circuit of claim 1, wherein the control circuit is further configured to control the precharge switching circuit to be in an off state if the output voltage is detected to be less than a reference voltage threshold when a preset period of time is reached; the reference voltage threshold is less than the precharge voltage threshold.
8. The power supply circuit of claim 1, wherein the control circuit is further configured to maintain the pre-charge switch circuit in an on state while controlling the main switch circuit to be on.
9. The power supply circuit of claim 1, wherein the pre-charge switching circuit comprises a fifth switching tube, a third bias resistor, and a first filter capacitor, a first end of the fifth switching tube configured to be connected to the power supply, a second end of the fifth switching tube connected to the current limiting circuit, a control end of the fifth switching tube configured to receive the pre-charge signal to turn on when the pre-charge signal is received; and the third bias resistor and the first filter capacitor are connected in parallel and then connected between the first end and the control end of the fifth switching tube.
10. The control method of the power supply circuit comprises a main switch circuit, a pre-charging switch circuit, a current limiting circuit, an auxiliary source circuit and a control circuit; the input end of the main switch circuit and the input end of the pre-charging switch circuit are both connected with the output end of the power supply, and the output end of the main switch circuit is the output end of the power supply circuit; the output end of the pre-charging switch circuit is connected with the input end of the current limiting circuit, and the output end of the current limiting circuit is connected with the output end of the main switch circuit; the power end of the auxiliary source circuit is connected between the pre-charging switch circuit and the current limiting circuit; the output end of the auxiliary source circuit is connected with the output end of the control circuit; the output end of the control circuit is connected with the output end of the power supply circuit; the precharge switching circuit is configured to turn on when receiving a precharge signal; the auxiliary source circuit is configured to be started when the input voltage of the power supply end is larger than the enabling voltage, and outputs a starting voltage to the control circuit after starting so as to start the control circuit, and the control circuit is configured to execute the control method after starting; the control method comprises the following steps:
obtaining the output voltage of the output end of the power supply circuit;
outputting a turn-on signal to the main switching circuit when the output voltage rises to a precharge voltage threshold; the turn-on signal is configured to turn on the main switching circuit such that the power supply supplies power through an output of the power supply circuit.
11. An energy storage device comprising a battery module and the power supply circuit of any one of claims 1-8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/127738 WO2024087062A1 (en) | 2022-10-26 | 2022-10-26 | Power supply circuit, control method for power supply circuit, and energy storage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116075999A true CN116075999A (en) | 2023-05-05 |
Family
ID=86170150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280005146.8A Pending CN116075999A (en) | 2022-10-26 | 2022-10-26 | Power supply circuit, control method of power supply circuit and energy storage device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116075999A (en) |
| WO (1) | WO2024087062A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212063613U (en) * | 2020-03-30 | 2020-12-01 | 深圳市泰和安科技有限公司 | Main and standby power supply circuit and fire-fighting emergency device |
| CN112491302A (en) * | 2020-12-03 | 2021-03-12 | 深圳市吉毅创能源科技有限公司 | Motor control device and motor start control method |
| CN215244353U (en) * | 2021-03-05 | 2021-12-21 | 苏州汇川联合动力系统有限公司 | Pre-charging circuit, controller and electric automobile |
| CN113285633A (en) * | 2021-05-12 | 2021-08-20 | 山东华力机电有限公司 | Integrated comprehensive controller, control box and control method for sprayer |
| CN215870821U (en) * | 2021-07-16 | 2022-02-18 | 湖北睿赛新能源科技有限公司 | Automatic pre-charging circuit and pre-charging system for load |
| CN216390792U (en) * | 2021-11-17 | 2022-04-26 | 深圳市正浩创新科技股份有限公司 | Starting circuit, power supply circuit and electronic equipment |
| CN216699814U (en) * | 2021-12-14 | 2022-06-07 | 深圳市德兰明海科技有限公司 | Switch tube drive circuit, pre-charging circuit and battery energy storage system |
-
2022
- 2022-10-26 WO PCT/CN2022/127738 patent/WO2024087062A1/en unknown
- 2022-10-26 CN CN202280005146.8A patent/CN116075999A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024087062A1 (en) | 2024-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10155449B2 (en) | Battery power integration apparatus and HEV power system having the same | |
| CN101888109A (en) | Storage battery charge control circuit adopting two-way reverse connecting protection | |
| CN110406381B (en) | Power battery precharge switching device based on IGBT module | |
| CN101938148A (en) | Battery charging circuit and battery power supply equipment | |
| CN112583087A (en) | Battery protection chip and system | |
| CN110994774B (en) | Power supply switching circuit | |
| CN201726176U (en) | Charge control circuit with bidirectional reverse connection protection for storage batteries | |
| CN210652697U (en) | Power battery pre-charging switch device based on IGBT module | |
| CN219204076U (en) | High-side driving output circuit | |
| CN112019013A (en) | High-power DCDC anti-impact reverse-connection-prevention slow starting circuit and control method | |
| WO2024087062A1 (en) | Power supply circuit, control method for power supply circuit, and energy storage device | |
| CN115642577A (en) | Hot plug circuit | |
| CN110784201A (en) | NMOS switch drive circuit and power supply device | |
| CN112769103B (en) | Transient supporting protection system for super capacitor | |
| CN114465473A (en) | Switching power supply circuit with digital surge current suppression function and electronic equipment | |
| CN208079034U (en) | One kind having short-circuit protection function modified driving circuit structure | |
| CN112952924A (en) | Battery management device and electrical apparatus | |
| CN214626342U (en) | Chip output short-circuit protection circuit | |
| CN111883085A (en) | Device for improving stable work of liquid crystal equipment | |
| CN110445360A (en) | DC power supply charging circuit and DC power supply charging equipment | |
| CN219372014U (en) | High-side driving circuit with overcurrent protection | |
| CN214176899U (en) | Overcurrent protection circuit | |
| TWI807862B (en) | Driving circuit applied to protection switch of battery module | |
| CN211239372U (en) | Battery management device and electrical apparatus | |
| CN219740345U (en) | MOS enhancement drive circuit and battery pack protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |