CN216016445U

CN216016445U - Direct current output circuit and energy storage equipment

Info

Publication number: CN216016445U
Application number: CN202122116685.4U
Authority: CN
Inventors: 王雷; 陈熙
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-03-11
Anticipated expiration: 2031-09-02

Abstract

The application provides a direct current output circuit and energy storage equipment, this direct current output circuit includes: the input end of the first switch circuit is used for being connected with the power circuit; the input end of the voltage conversion circuit is connected with the output end of the first switch circuit; the sampling circuit comprises a sampling resistor, and the first end of the sampling resistor is connected with the output end of the voltage conversion circuit; the direct current output port is connected with the second end of the sampling resistor; the control circuit is connected with the first end and the second end of the sampling resistor and the controlled end of the voltage conversion circuit; the first end of the first negative voltage eliminating circuit is connected with the second end of the sampling resistor, and the second end of the first negative voltage eliminating circuit is grounded and used for forming a discharging loop with the sampling resistor to eliminate negative voltage on the sampling circuit. The circuit protection is realized by eliminating the negative voltage on each device of the direct current output circuit.

Description

Direct current output circuit and energy storage equipment

Technical Field

The application relates to the technical field of circuit protection, in particular to a direct current output circuit and energy storage equipment.

Background

Currently, the dc output circuit is an output circuit for outputting a dc power to the outside, and the dc output circuit mainly controls the dc output circuit to output the dc power to the outside through a control chip, so as to supply power to an external device. In the testing process of the direct current output circuit, the inventor finds that when the direct current output port of the direct current output circuit carries an inductive load and the direct current output from the direct current output port is cut off, a large negative voltage can be generated on the direct current output port and a device connected with the direct current output port, the maximum value and the existence time of the negative voltage exceed the bearing capacity of the control chip, and the control chip is damaged after long-term use, so that the direct current output circuit fails to work.

SUMMERY OF THE UTILITY MODEL

The present application is directed to a dc output circuit, which is designed to eliminate negative voltages on devices of the dc output circuit, thereby protecting the dc output circuit.

In a first aspect, the present application provides a dc output circuit, which includes a first switch circuit, a voltage conversion circuit, a sampling circuit, a control circuit, a dc output port, and a first negative voltage cancellation circuit;

the input end of the first switch circuit is used for being connected with a power supply circuit and is used for connecting or disconnecting the direct current output by the power supply circuit;

the input end of the voltage conversion circuit is connected with the output end of the first switch circuit and is used for performing voltage conversion on the direct current output by the power supply circuit;

the sampling circuit comprises a sampling resistor, and the first end of the sampling resistor is connected with the output end of the voltage conversion circuit; the direct current output port is connected with the second end of the sampling resistor and is used for connecting a load;

the control circuit is connected with the first end and the second end of the sampling resistor, is connected with the controlled end of the voltage conversion circuit, and is used for obtaining the output current value of the voltage conversion circuit according to the voltage values at the two ends of the sampling resistor and controlling the voltage conversion circuit according to the output current value;

the first end of the first negative voltage eliminating circuit is connected with the second end of the sampling resistor, and the second end of the first negative voltage eliminating circuit is grounded and used for forming a discharging loop with the sampling resistor to eliminate negative voltage on the sampling circuit.

In one embodiment, the first negative voltage cancellation circuit includes a first diode, a cathode of the first diode is connected to the second end of the sampling resistor, and an anode of the first diode is grounded.

In one embodiment, the first diode comprises a schottky diode.

In one embodiment, the sampling circuit further comprises a first resistor, a second resistor and a first capacitor;

the first end of the first resistor is connected with the first end of the sampling resistor, and the second end of the first resistor is connected with the first sampling end of the control circuit;

the first end of the second resistor is connected with the second end of the sampling resistor, and the second end of the second resistor is connected with the second sampling end of the control circuit;

the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is connected with the second end of the second resistor.

In one embodiment, the dc output circuit further includes a filter circuit, a second switch circuit, and a second negative voltage cancellation circuit;

the first end of the filter circuit is connected with the output end of the sampling circuit, and the second end of the filter circuit is grounded; the first end of the filter circuit is also connected with the anode of the direct current output port;

the first end of the second switch circuit is connected with the second end of the filter circuit, the second end of the second switch circuit is connected with the negative electrode of the direct current output port, and the second end of the second switch circuit is grounded; the controlled end of the second switch circuit is connected with the control circuit so as to be switched on or switched off according to a control signal sent by the control circuit;

a first end of the second negative voltage eliminating circuit is connected with the positive electrode of the direct current output port, a second end of the second negative voltage eliminating circuit is connected with the negative electrode of the direct current output port, and a second end of the second negative voltage eliminating circuit is also connected with a second end of the second switch circuit; the second negative voltage eliminating circuit is used for forming a discharging loop with the direct current output port to protect the second switch circuit.

In an embodiment, the second negative voltage cancellation circuit includes a second diode, a cathode of the second diode is connected to the anode of the dc output port, an anode of the second diode is connected to the cathode of the dc output port, and the anode of the second diode is further grounded.

In an embodiment, the dc output circuit further includes a driving circuit, an input terminal of the driving circuit is connected to an enable terminal of the control circuit, and an output terminal of the driving circuit is connected to a controlled terminal of the second switching circuit;

the driving circuit is used for receiving a first enabling signal sent by the control circuit and generating a second enabling signal according to the first enabling signal;

the second switch circuit is used for being switched on according to the second enabling signal and switching off the second switch circuit when the second enabling signal is stopped being received.

In an embodiment, the dc output circuit further includes a main controller and a driving circuit, an input end of the driving circuit is connected to the main controller, and an output end of the driving circuit is connected to a controlled end of the second switching circuit; the main controller is also connected with the control circuit;

the main controller is used for outputting a first starting signal to the driving circuit when receiving a starting instruction, and outputting a second starting signal to the control circuit after delaying a first preset time;

the main controller is further configured to output a first turn-off signal to the control circuit when receiving a turn-off instruction, and output a second turn-off signal to the driving circuit after delaying a preset time.

In one embodiment, the second switch circuit comprises a first field effect transistor, a second field effect transistor, a third resistor, a fourth resistor and a third diode;

the first end of the first field effect transistor is connected with the second end of the filter circuit, the second end of the first field effect transistor is connected with the control end of the third resistor, and the second end of the first field effect transistor is grounded;

the first end of the second field effect transistor is connected with the second end of the first field effect transistor, the control end of the second field effect transistor is connected with the second end of the third resistor, and the second end of the second field effect transistor is connected with the negative electrode of the direct current output port;

the first end of the third resistor is connected with the control circuit;

the cathode of the third diode is connected with the second end of the third resistor, the anode of the third diode is connected with the second end of the first field effect transistor and the first end of the second field effect transistor, and the fourth resistor is connected with the third diode in parallel.

In a second aspect, an embodiment of the present application further provides an energy storage device, including:

a power supply circuit for supplying a direct current;

the direct current output circuit according to any one of the embodiments, connected to the power supply circuit, for outputting the direct current to a load.

The application provides a direct current output circuit and energy storage equipment, wherein the direct current output circuit comprises a first switch circuit, a voltage conversion circuit, a sampling circuit, a control circuit, a direct current output port and a first negative voltage elimination circuit, wherein the input end of the first switch circuit is used for being connected with a power supply circuit and connecting or disconnecting direct current output by the power supply circuit; the input end of the voltage conversion circuit is connected with the output end of the first switch circuit and is used for performing voltage conversion on the direct current output by the power supply circuit; the sampling circuit comprises a sampling resistor, and the first end of the sampling resistor is connected with the output end of the voltage conversion circuit; the direct current output port is connected with the second end of the sampling resistor and is used for connecting a load; the control circuit is connected with the first end and the second end of the sampling resistor, is connected with the controlled end of the voltage conversion circuit, and is used for obtaining the output current value of the voltage conversion circuit according to the voltage values at the two ends of the sampling resistor and controlling the voltage conversion circuit according to the output current value; the first end of the first negative voltage eliminating circuit is connected with the second end of the sampling resistor, and the second end of the first negative voltage eliminating circuit is grounded and used for forming a discharging loop with the sampling resistor to eliminate negative voltage on the sampling circuit, so that damage to the control circuit caused by negative voltage on the sampling circuit is avoided, and protection of the direct current output circuit is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a circuit diagram of an embodiment of a dc output circuit provided in an embodiment of the present application;

fig. 2 is a circuit schematic diagram of another implementation of a dc output circuit provided in an embodiment of the present application;

fig. 3 is a circuit schematic diagram of another implementation of a dc output circuit provided by an embodiment of the present application;

fig. 4 is a circuit schematic diagram of another implementation of a dc output circuit provided by an embodiment of the present application;

fig. 5 is a circuit schematic diagram of another implementation of a dc output circuit provided by an embodiment of the present application;

fig. 6 is a circuit schematic diagram of another implementation of a dc output circuit provided by an embodiment of the present application;

fig. 7 is a circuit schematic diagram of another implementation of a dc output circuit provided by an embodiment of the present application;

fig. 8 is a circuit schematic diagram of another implementation of a dc output circuit provided by an embodiment of the present application;

fig. 9 is a circuit diagram of an embodiment of a driving circuit provided in an embodiment of the present application;

fig. 10 is a circuit schematic diagram of another implementation of a dc output circuit provided by an embodiment of the present application;

fig. 11 is a schematic structural diagram of an energy storage device according to an embodiment of the present application.

The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, fig. 1 is a circuit schematic diagram of an embodiment of a dc output circuit according to an embodiment of the present disclosure.

As shown in fig. 1, the dc output circuit includes a first switch circuit 10, a voltage conversion circuit 20, a sampling circuit 30, a control circuit 40, a dc output port 50, and a first negative voltage cancellation circuit 60.

In one embodiment, as shown in fig. 1 to 4, the dc output circuit includes a first switch circuit 10, and an input terminal of the first switch circuit 10 is used for connecting to the power circuit and for connecting or disconnecting the dc power output by the power circuit. The first switch circuit 10 includes, for example, a triode switch circuit, a field effect transistor switch circuit, a mechanical switch circuit, or the like, which is not limited in this embodiment.

Illustratively, the first switch circuit 10 is connected to a switch button, and the switch button controls the first switch circuit 10 to connect or disconnect the dc power output by the power circuit. The user can trigger the switch button according to actual needs, and control the on or off of the switch button, thereby controlling the first switch circuit 10 to connect or disconnect the direct current output by the power circuit.

The power circuit comprises a direct current power supply and is used for supplying direct current to the direct current output circuit. The power circuit may include a battery module including one or more electrical energy storage units, such as one or more batteries. A plurality of batteries can be connected in series and parallel to form the battery module.

In an embodiment, an input terminal of the voltage converting circuit 20 is connected to an output terminal of the first switch circuit 10, and is used for performing voltage conversion on the dc power output by the power supply circuit. The voltage conversion circuit 20 may be a voltage boosting circuit or a voltage reducing circuit. Illustratively, the 24V dc power output by the power circuit is converted into 12V dc power by the voltage converting circuit 20.

In an embodiment, as shown in fig. 2 to 4, the sampling circuit 30 includes a sampling resistor R0, a first end of the sampling resistor R0 is connected to the output terminal of the voltage converting circuit 20, and a second end of the sampling resistor R0 is connected to the dc output port 50. It should be noted that when the dc output port 50 carries an inductive load and the dc output from the dc output port 50 is cut off, a large negative voltage is generated on the sampling resistor R0 connected to the dc output port 50.

As shown in fig. 2 to 4, the sampling circuit 30 further includes a first resistor R1, a second resistor R2, and a first capacitor C1; a first end of the first resistor R1 is connected with a first end of the sampling resistor R0, and a second end of the first resistor R1 is connected with a first sampling end of the control circuit 40; a first end of the second resistor R2 is connected with a second end of the sampling resistor R0, and a second end of the second resistor R2 is connected with a second sampling end of the control circuit 40; the first end of the first capacitor C1 is connected to the second end of the first resistor R1, and the second end of the first capacitor C1 is connected to the second end of the second resistor R2. The sampling circuit 30 can accurately detect the output current value of the voltage conversion circuit 20.

In an embodiment, as shown in fig. 1 to 4, the control circuit 40 is connected to the first terminal and the second terminal of the sampling resistor R0 and to the controlled terminal of the voltage converting circuit 20, the control circuit 40 is configured to obtain an output current value of the voltage converting circuit 20 according to a voltage value at two terminals of the sampling resistor R0, and control the voltage converting circuit 20 according to the output current value; the control circuit 40 may include a control chip, such as a driving IC chip.

Illustratively, a first sampling terminal of the control circuit 40 is connected to the first resistor R1 for collecting a first voltage at a first terminal of the sampling resistor R0; the second sampling end of the control circuit 40 is connected with a second resistor R2 and is used for collecting a second voltage at the second end of the sampling resistor R0; the current value of the sampling resistor R0 can be calculated from the voltage difference between the first voltage and the second voltage of the sampling resistor R0 and the resistance value of the sampling resistor R0, and the current value of the sampling resistor R0 is the output current value of the voltage conversion circuit 20.

In one embodiment, the dc output port 50 is connected to the second end of the sampling resistor R0, and the dc output port 50 is used to connect to a load, thereby supplying power to the load. The dc output circuit may be a vehicle charging output circuit, that is, a vehicle charging output circuit that outputs dc power externally, and the dc output port 50 may be a vehicle charging output port, for example, the dc output port 50 is a cigarette lighter, and the vehicle charging output circuit can supply power to devices such as a vehicle refrigerator through the dc output port 50.

In an embodiment, as shown in fig. 1 to 4, a first terminal of the first negative voltage cancellation circuit 60 is connected to a second terminal of the sampling resistor R0, and the second terminal of the first negative voltage cancellation circuit 60 is grounded, so as to form a discharge loop with the sampling resistor R0 to cancel the negative voltage on the sampling circuit 30. It should be noted that, when negative voltage exists across the sampling resistor R0 in the sampling circuit 30, the negative voltage easily damages the control chip in the control circuit 40 and disables the dc output circuit, and the first negative voltage cancellation circuit 60 can effectively cancel the negative voltage across the sampling circuit 30, thereby preventing the control chip in the control circuit 40 from being damaged by negative voltage impact, and protecting the dc output circuit.

In one embodiment, as shown in fig. 3 and 4, the first negative voltage elimination circuit 60 includes a first diode D1, a cathode of the first diode D1 is connected to the second terminal of the sampling resistor, and an anode of the first diode D1 is grounded. When the dc output port 50 carries an inductive load and the dc output from the dc output port 50 is turned off (i.e. the first switch circuit 10 is turned off), a large negative voltage is generated on the sampling resistor R0 connected to the dc output port 50, at this time, the voltage at the anode end of the first diode D1 is higher than the voltage at the cathode end of the first diode D1, and the first diode D1 is turned on and forms a bleeding loop with the sampling resistor R0. By forming a discharge loop among the sampling resistor R0, the first diode D1 and the ground, the negative voltage on the sampling resistor R0 can be effectively eliminated, the control chip in the control circuit 40 is prevented from being damaged by negative voltage impact, and the control chip is protected.

Illustratively, the first diode comprises a schottky diode, and the voltage drop of the schottky diode is small and is only 0.5V, which can effectively reduce the negative voltage on the sampling resistor R0, thereby maintaining the voltage of each pin of the control chip within a safe range. Specifically, when a negative voltage exists on the sampling resistor R0, that is, the voltage of the ground GND is higher than the voltage on the sampling resistor R0, the ground GND can discharge the sampling resistor R0 through the schottky diode, so that the negative voltage on the sampling resistor R0 is eliminated, and the control circuit 40 is protected.

For example, if the negative voltage on the sampling resistor R0 is not reduced, when the external device is powered by the dc output circuit next time, the negative voltage on the sampling resistor R0 may cause negative voltage impact to the external device, which may damage the external device. The negative voltage on the sampling resistor R0 can be well reduced through the first diode, negative voltage impact on external equipment caused by the direct current output circuit is avoided, and the external equipment connected with the direct current output port 50 is protected.

In an embodiment, as shown in fig. 4, the dc output circuit further includes a filter circuit 70, a first end of the filter circuit 70 is connected to the output end of the sampling circuit 30, a second end of the filter circuit 70 is grounded, and the filter circuit 70 is configured to filter the dc power output by the sampling circuit 30, so as to filter a ripple in the dc power, and make the dc power output to the dc output port 50 smoother.

Illustratively, the filter circuit 70 includes a plurality of capacitors connected in parallel, a first terminal of each capacitor is connected to the second terminal of the sampling resistor R0, and a second terminal of each capacitor is connected to ground. It is understood that the capacitance values of the capacitors in the filter circuit 70 may be the same or different, and the frequency bands of the interference that can be filtered by the capacitors with different capacitance values are different.

In one embodiment, as shown in fig. 5 to 7, the dc output circuit further includes a filter circuit 70 and a second switch circuit 80; the first end of the filter circuit 70 is connected with the output end of the sampling circuit 30, the second end of the filter circuit 70 is grounded, and the first end of the filter circuit 70 is also connected with the anode of the dc output port 50; a first end of the second switch circuit 80 is connected to the second end of the filter circuit 70, a second end of the second switch circuit 80 is connected to the negative electrode of the dc output port 50, and a second end of the second switch circuit 80 is grounded; the controlled terminal of the second switch circuit 80 is connected to the control circuit 40 to be turned on or off according to a control signal transmitted from the control circuit 40.

The filter circuit 70 is configured to filter the direct current output by the sampling circuit 30, and the filter circuit 70 may include a plurality of capacitors connected in parallel. The dc output port 50 includes an anode and a cathode, the second switch circuit 80 is used for controlling the on/off of the cathode loop of the dc output port 50, and when the second switch circuit 80 is in the on state, the dc output port 50 can normally output the external power. Optionally, the second switch circuit 80 includes a triode switch circuit, a field effect transistor switch circuit, a mechanical switch circuit, or the like.

In an embodiment, as shown in fig. 5 to 7, the dc output circuit further includes a second negative voltage cancellation circuit 90, a first end of the second negative voltage cancellation circuit 90 is connected to the positive electrode of the dc output port 50, a second end of the second negative voltage cancellation circuit 90 is connected to the negative electrode of the dc output port 50, and a second end of the second negative voltage cancellation circuit 90 is further connected to a second end of the second switch circuit 80; the second negative voltage cancellation circuit 90 is used to form a discharge loop with the dc output port 50 to protect the second switch circuit 80.

For example, as shown in fig. 6 to 7, the second negative voltage cancellation circuit 90 includes a second diode D2, a cathode of the second diode D2 is connected to the anode of the dc output port 50, an anode of the second diode D2 is connected to the cathode of the dc output port 50, and an anode of the second diode D2 is also connected to ground. A second capacitor C2 may be connected between the positive and negative poles of the dc output port 50. When the dc output port 50 carries an inductive load and the dc output from the dc output port 50 is cut off, a negative voltage impact is generated on the dc output port 50, and the negative voltage impact can reach about-50V at the lowest, for example, the withstand voltage of the MOS transistor in the second switch circuit 80 is 40V, the negative voltage value on the dc output port 50 exceeds the withstand voltage of the MOS transistor, and the negative voltage impact easily damages the switch device in the second switch circuit 80. In this embodiment, a discharge loop can be formed between the grounded second diode D2 and the dc output port 50, so that negative voltage impact released by the dc output port 50 is effectively eliminated, and the switch device in the second switch circuit 80 is prevented from being damaged by the negative voltage impact, thereby implementing circuit protection.

Illustratively, the second diode D2 includes a transient diode (TVS diode), which is turned on when the negative voltage is lower than-30V, so as to discharge the negative voltage at the dc output port 50, maintain the negative voltage at the dc output port 50 within-30V, protect devices such as MOS transistors in the second switch circuit 80 from breakdown, and also satisfy the requirement of outputting dc power by using a dc output circuit, for example, the dc output circuit may be connected to a battery module providing 24V dc power.

In one embodiment, as shown in fig. 7, the second switch circuit 80 includes a first fet Q1, a second fet Q2, a third resistor R3, a fourth resistor R4, and a third diode D3.

A first end of the first field-effect transistor Q1 is connected with a second end of the filter circuit 70, a control end of the first field-effect transistor Q1 is connected with a second end of the third resistor R3, and a second end of the first field-effect transistor Q1 is grounded; a first end of the second fet Q2 is connected to the second end of the first fet Q1, a control end of the second fet Q2 is connected to the second end of the third resistor R3, and a second end of the second fet Q2 is connected to the negative electrode of the dc output port 50.

A first end of the third resistor R3 is connected to the control circuit 40 and is configured to receive an enable signal output by the control circuit 40, a second end of the third resistor R3 is connected to the control end of the first fet Q2 and the control end of the second fet Q2, and the third resistor R3 is configured to perform a voltage division function; the cathode of the third diode D3 is connected to the second terminal of the third resistor R3, the anode of the third diode D3 is connected to the second terminal of the first fet Q1 and the first terminal of the second fet Q2, and the fourth resistor R4 is connected in parallel to the third diode D3, that is, the first terminal of the fourth resistor R4 and the second terminal of the third resistor R3 are connected to the first terminal of the fourth resistor R4 and the first terminal of the second fet Q2, so as to stabilize the voltage of the second switch circuit 80 through the fourth resistor R4 and the third diode D3.

In an embodiment, the second switch circuit 80 further includes a fifth resistor R5 and a sixth resistor R6, the fifth resistor R5 is connected between the control end of the first fet Q1 and the second end of the third resistor R3, and the fifth resistor R5 performs a voltage division function to prevent the voltage of the enable signal output by the control circuit 40 from being too large and causing damage to the first fet Q1; the sixth resistor R6 is connected between the control terminal of the second fet Q2 and the second terminal of the third resistor R3, and the same sixth resistor R6 also functions as a voltage divider to protect the second fet Q2. The dc output circuit may further include a seventh resistor R7, the seventh resistor R7 is connected between the first terminal of the first fet Q1 and the second terminal of the filter circuit 70, and the current flowing through the second switch circuit 80 may be sampled by the seventh resistor R7.

When the first terminal of the third resistor R3 receives the enable signal output from the control circuit 40, the first fet Q1 and the second fet Q2 are turned on, and when the first terminal of the third resistor R3 stops receiving the enable signal, the first fet Q1 and the second fet Q2 are turned off.

In an embodiment, as shown in fig. 8, the dc output circuit further includes a driving circuit 100, an input terminal of the driving circuit 100 is connected to an enable terminal of the control circuit 40, and an output terminal of the driving circuit 100 is connected to a controlled terminal of the second switching circuit 80; the driving circuit 100 is configured to receive the first enable signal EN _ CAR1 sent by the control circuit 40, and generate a second enable signal EN _ CAR2 according to the first enable signal EN _ CAR 1; the second switch circuit 80 is configured to turn on according to the second enable signal EN _ CAR2, and turn off the second switch circuit 80 when the second enable signal EN _ CAR2 stops being received.

It should be noted that the second switch circuit 80 is configured to be turned on when receiving the second enable signal EN _ CAR2, and turned off when not receiving the second enable signal EN _ CAR 2. Specifically, when the dc output port 50 is required to be used for external output (for example, the first switch circuit 10 is turned on, or a discharge command from the mobile terminal is received), the enable terminal of the control circuit 40 outputs the first enable signal EN _ CAR1, and at the same time, the first enable signal EN _ CAR1 synchronously generates the second enable signal EN _ CAR2 to the second switch circuit 80 through the driving circuit 100, so that the second switch circuit 80 is turned on, and the dc output port 50 can normally perform external output.

Illustratively, as shown in fig. 9, the driving circuit 100 includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, a third fet Q3, and a fourth fet Q4. The first end of the resistor R8 is connected with the enable end of the control circuit 40 and is used for receiving a first enable signal EN _ CAR1 sent by the control circuit 40, the second end of the resistor R8 is connected with the control end of the third field effect transistor Q3, the second end of the resistor R8 is also connected with the first end of the resistor R9, and the second end of the resistor R9 is grounded; a first end of the third field effect transistor Q3 is grounded and connected with a second end of the resistor R9, and a second end of the third field effect transistor Q3 is connected with a first end of the resistor R10; the second end of the resistor R10 is connected with the control end of the fourth field effect transistor Q4 and is also connected with the first end of the resistor R11; the second terminal of the resistor R11 is connected to a preset voltage source VDD, the first terminal of the fourth fet Q4 is connected to the preset voltage source VDD, and the second terminal of the fourth fet Q4 is connected to the controlled terminal of the second switch circuit 80, for outputting the second enable signal EN _ CAR2 to the second switch circuit 80.

When the first end of the resistor R8 receives the first enable signal EN _ CAR1 sent by the control circuit 40, the third fet Q3 is turned on, and the fourth fet Q4 is turned on along with the turn-on of the third fet Q3, so as to generate the second enable signal EN _ CAR2 under the influence of the preset voltage source VDD, and output the second enable signal EN _ CAR2 through the second end of the fourth fet Q4; the first end of the resistor R8 stops receiving the first enable signal EN _ CAR1 sent by the control circuit 40, the third fet Q3 is turned off, and the fourth fet Q4 is turned off when the third fet Q3 is turned off, so that the output of the second enable signal EN _ CAR2 is stopped.

In one embodiment, as shown in fig. 10, the dc output circuit further includes a main controller 110 and a driving circuit 100, an input terminal of the driving circuit 100 is connected to the main controller 110, and an output terminal of the driving circuit 100 is connected to the controlled terminal of the second switching circuit 80; the main controller 110 is also connected to the control circuit 40.

The main controller 110 is configured to output a first start signal to the driving circuit 100 when receiving a start instruction, and output a second start signal to the control circuit 40 after delaying a first preset time; the main controller 110 is further configured to output a first turn-off signal to the driving circuit 100 when receiving the turn-off command, and output a second turn-off signal to the second switch circuit 80 after delaying a preset time.

It should be noted that the main controller 110 is used for controlling the dc output circuit to be turned on or off; when the direct current output circuit needs to be controlled to be conducted, the main controller 110 receives a start instruction and outputs a first start signal to the driving circuit 100, the driving circuit 100 generates a corresponding conducting signal according to the first start signal after receiving the first start signal to control the second switch circuit 80 to be conducted, and the main controller 110 is further configured to send a second start signal to the control circuit 40. A time interval exists between the first starting signal and the second starting signal sent by the main controller, and the time interval is a first preset time length.

Similarly, when the dc output circuit needs to be turned off, the main controller 110 receives the turn-off instruction and outputs a first turn-off signal to the control circuit 100, and the control circuit 100 stops working after receiving the first turn-off signal; the main controller 10 is further configured to send a second turn-off signal to the driving circuit 100, the driving circuit generates a corresponding turn-off signal according to the second turn-off signal to control the second switch circuit 80 to turn off, and a time interval exists between the sending of the first turn-off signal and the sending of the second turn-off signal by the main controller 110, where the time interval is a second preset time duration.

It should be noted that, after the driving circuit 100 receives the second turn-off signal, the level of the second enable signal EN _ CAR2 for controlling the second switch circuit 80 is pulled low, and due to the existence of the energy storage element such as the filter circuit 70, the energy stored by the capacitor in the filter circuit 70 cannot be discharged after the dc output circuit is turned off, at this time, the second switch circuit 80 is turned off for a second preset time delay with respect to the control circuit 40, and the time is just used as the discharge time of the energy storage element in the dc output circuit, so that the residual electricity on each device stored in the dc output circuit is reduced, and the impact caused by the residual electricity during the next starting process is avoided. That is, in the embodiment, the second switch circuit is turned on before the control circuit and turned off after the control circuit, so that the residual power in the circuit can be released in time, and a large impact cannot be generated in the restarting process.

The dc output circuit of the above embodiment includes a first switch circuit 10, a voltage conversion circuit 20, a sampling circuit 30, a control circuit 40, a dc output port 50, and a first negative voltage cancellation circuit 60, wherein an input terminal of the first switch circuit 10 is used for connecting with a power circuit and connecting or disconnecting a dc power output by the power circuit; the input end of the voltage conversion circuit 20 is connected with the output end of the first switch circuit 10, and is used for performing voltage conversion on the direct current output by the power supply circuit; the sampling circuit 30 comprises a sampling resistor, and a first end of the sampling resistor is connected with the output end of the voltage conversion circuit 20; the direct current output port 50 is connected with the second end of the sampling resistor and is used for connecting a load; the control circuit 40 is connected with the first end and the second end of the sampling resistor, and the controlled end of the voltage conversion circuit 20, and is used for obtaining the output current value of the voltage conversion circuit 20 according to the voltage values at the two ends of the sampling resistor and controlling the voltage conversion circuit 20 according to the output current value; the first end of the first negative voltage eliminating circuit 60 is connected with the second end of the sampling resistor, and the second end of the first negative voltage eliminating circuit 60 is grounded and used for forming a discharging loop with the sampling resistor to eliminate the negative voltage on the sampling circuit 30, so that the control circuit 40 is prevented from being damaged by the negative voltage on the sampling circuit 30, and the protection of the direct current output circuit is realized.

Referring to fig. 11, fig. 11 is a schematic structural diagram of an energy storage device according to an embodiment of the present disclosure.

As shown in fig. 11, the energy storage device 200 includes:

a power supply circuit 210 for supplying a direct current;

in the above embodiment, the dc output circuit 220 is connected to the power circuit 210, and the dc output circuit 220 is used for outputting the dc power provided by the power circuit 210 to a load.

In an embodiment, the dc output circuit 220 may be configured with reference to the examples in fig. 1 to 10, for example, the dc output circuit 220 includes the first switch circuit 10, the voltage conversion circuit 20, the sampling circuit 30, the control circuit 40, the dc output port 50, and the first negative voltage cancellation circuit 60 described in the foregoing embodiments, and a specific configuration of the dc output circuit 220 may refer to the corresponding embodiments described in this specification, which is not repeated herein.

For example, the energy storage device 200 forms a discharge loop through the first negative voltage eliminating circuit in the dc output circuit 220 and the sampling resistor in the sampling circuit to eliminate the negative voltage on the sampling circuit, so as to prevent the negative voltage on the sampling circuit from damaging the control chip in the control circuit, and thus protect the dc output circuit. Meanwhile, the damage of negative pressure impact in the direct current output circuit 220 to external equipment connected with the direct current output port is avoided, and the external equipment is protected.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of the application. The components and arrangements of specific examples are described above to simplify the present disclosure. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present application are intended to be covered by the present application.

Claims

1. A direct current output circuit is characterized by comprising a first switch circuit, a voltage conversion circuit, a sampling circuit, a control circuit, a direct current output port and a first negative voltage elimination circuit;

2. The dc output circuit of claim 1, wherein the first negative voltage cancellation circuit comprises a first diode, a cathode of the first diode is connected to the second terminal of the sampling resistor, and an anode of the first diode is grounded.

3. The dc output circuit of claim 2, wherein the first diode comprises a schottky diode.

4. The dc output circuit of claim 1, wherein the sampling circuit further comprises a first resistor, a second resistor, and a first capacitor;

5. The direct current output circuit according to any one of claims 1 to 4, wherein the direct current output circuit further comprises a filter circuit, a second switch circuit and a second negative voltage elimination circuit;

6. The DC output circuit of claim 5, wherein the second negative voltage cancellation circuit comprises a second diode, a cathode of the second diode is connected to an anode of the DC output port, an anode of the second diode is connected to a cathode of the DC output port, and an anode of the second diode is further connected to ground.

7. The dc output circuit according to claim 5, further comprising a driving circuit, wherein an input terminal of the driving circuit is connected to an enable terminal of the control circuit, and an output terminal of the driving circuit is connected to a controlled terminal of the second switching circuit;

8. The dc output circuit of claim 5, further comprising a main controller and a driving circuit, wherein an input terminal of the driving circuit is connected to the main controller, and an output terminal of the driving circuit is connected to the controlled terminal of the second switching circuit; the main controller is also connected with the control circuit;

9. The dc output circuit of claim 5, wherein the second switching circuit comprises a first field effect transistor, a second field effect transistor, a third resistor, a fourth resistor, and a third diode;

the first end of the first field effect transistor is connected with the second end of the filter circuit, the control end of the first field effect transistor is connected with the second end of the third resistor, and the second end of the first field effect transistor is grounded;

the first end of the third resistor is connected with the control circuit;

10. An energy storage device, comprising:

a power supply circuit for supplying a direct current;

the dc output circuit of any of claims 1-9, coupled to the power circuit, for outputting the dc power to a load.