Power supply black start circuit

Abstract

The utility model discloses a power supply black start circuit, which belongs to the technical field of light-storage all-in-one machine power supply black start and comprises a power taking module, a power supply module, a signal detection module and an auxiliary source module. The power supply module is electrically connected with the power taking module, the signal detection module and the auxiliary source module. The auxiliary source module is used for receiving current transmitted by the power supply module when the power taking module is in a starting state; according to the scheme, the auxiliary source module is started according to the pressing time of the self-reset button of the power taking module, a specific off-grid working mode can be entered, meanwhile, the power supply module supplies power to the circuit, the self-reset button only provides an initial power-on condition and an off-grid starting-up mark, in addition, starting and closing of the auxiliary source module can be controlled through the MCU, and the power-on operation is convenient. And when the auxiliary source module needs to be closed, the button does not need to be operated again, and an auxiliary source closing command is issued through the MCU.

Description

Technical Field

[0001] The utility model relates to the technical field of black start of a power supply of an integrated optical storage device, and in particular to a black start circuit of a power supply. Background Art

[0002] When the black start circuit of the household photovoltaic storage integrated power supply is started, the traditional solution controls the opening and closing of the auxiliary source by switching the switch on and off. Since the auxiliary source needs to be turned on in both on-grid and off-grid modes, the switch closing and opening states cannot be used as off-grid startup instructions. The opening and closing of the auxiliary source must be controlled by manual operation of the switch, and when the switch controls the auxiliary source, the switching device needs to continuously flow current, which has certain requirements for the selection of the switch. Utility Model Content

[0003] In order to solve the problems of the prior art, the utility model provides a power supply black start circuit, including: a power taking module, a power supply module, a signal detection module and an auxiliary source module;

[0004] The power supply module is respectively connected to the power taking module, the signal detection module and the auxiliary source module;

[0005] The power taking module is used to take power from the power supply module. Meanwhile, the signal detection module is used to detect whether the power taking module is in a startup state. The auxiliary source module is used to receive the current delivered by the power supply module when the power taking module is in a startup state.

[0006] Furthermore, the power supply module includes: a diode D2, a voltage regulator Q2, a power MOS tube, a voltage regulator D4 and a transistor Q1;

[0007] The anode of the diode D2 is electrically connected to the positive terminal of the battery through the pin Vbat, and the cathode of the diode D2 is electrically connected to the cathode of the voltage regulator tube D4 through the resistor R1;

[0008] The cathode of the diode D2 is also electrically connected to the cathode of the voltage regulator tube Q2;

[0009] A resistor R6 is connected in parallel to both ends of the voltage regulator tube Q2, a capacitor C3 is connected in parallel to both ends of the resistor R6, both ends of the capacitor C3 are electrically connected to the power MOS tube, and the power MOS tube is electrically connected to the pin Vout;

[0010] The base of the transistor Q1 is electrically connected to the wire between the resistor R1 and the voltage regulator D4, the collector of the transistor Q1 is connected to one end of the resistor R6 through the resistor R5, and the emitter of the transistor Q1 is connected to the power taking module and the signal detection module respectively;

[0011] The base of the transistor Q1 and the emitter of the transistor Q1 are electrically connected via a resistor R4, and the base of the transistor Q1 and the emitter of the transistor Q1 are also electrically connected via a capacitor C2, the capacitor C2 is connected in parallel with the resistor R4, and the capacitor C2 is arranged close to the transistor Q1.

[0012] Furthermore, the power taking module includes: a switch S1, a common mode inductor L1, a TVS tube D1 and a diode D3;

[0013] The anode of the diode D3 is respectively connected to the signal detection module, the emitter of the transistor Q1, the resistor R4 and the capacitor C2, the cathode of the diode D3 is connected to one end of the TVS tube D1, and the other end of the TVS tube D1 is grounded;

[0014] The switch S1 is connected to one end of the common-mode inductor L1 , and the other end of the common-mode inductor L1 is connected in parallel to the TVS tube D1 .

[0015] Furthermore, the signal detection module includes: a resistor R9 and an MCU;

[0016] The emitter of the transistor Q1 is connected to the MCU via the resistor R9. When the switch S1 is closed, the MCU can detect whether there is a voltage signal in the circuit.

[0017] Further, the auxiliary source module includes: a signal MOS1 tube and an electronic switch;

[0018] The drain of the signal MOS1 tube is electrically connected to the anode of the diode D3, the source of the signal MOS1 tube is connected to the gate of the signal MOS1 tube via a resistor R2, and the source of the signal MOS1 tube is grounded;

[0019] The two ends of the resistor R2 are connected in parallel with a capacitor C1;

[0020] The gate of the signal MOS1 tube is connected to the electronic switch through a resistor R8.

[0021] Beneficial effects of the utility model:

[0022] Compared with the traditional solution of starting and stopping the auxiliary source by closing and opening the operating switch, this solution turns on the auxiliary source module by pressing the self-reset button of the power-taking module, and can enter a specific off-grid working mode. At the same time, the power supply module supplies power to the circuit, and the self-reset button only provides the initial power-on condition and the off-grid startup mark. In addition, the opening and closing of the auxiliary source module can be controlled by the MCU, and when the auxiliary source module needs to be turned off, there is no need to operate the button again, and the auxiliary source shutdown command can be issued by the MCU. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 The utility model is a circuit diagram of a power supply black start circuit.

[0025] Reference numerals: 1 is a power MOS tube, 2 is a switch S1, 3 is a common mode inductor L1, 4 is an MCU, 5 is a signal MOS1 tube, and 6 is an electronic switch. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] See also Figure 1 , a power supply black start circuit, comprising: a power taking module, a power supply module, a signal detection module and an auxiliary source module;

[0028] The power supply module is respectively connected to the power taking module, the signal detection module and the auxiliary source module;

[0029] The power taking module is used to take power from the power supply module. Meanwhile, the signal detection module is used to detect whether the power taking module is in a startup state. The auxiliary source module is used to receive the current delivered by the power supply module when the power taking module is in a startup state.

[0030] The power supply module includes: a diode D2, a voltage regulator Q2, a power MOS tube 1, a voltage regulator D4 and a transistor Q1;

[0031] The power taking module includes: a switch S1, a common mode inductor L1, a TVS tube D1 and a diode D3;

[0032] The signal detection module includes: a resistor R9 and an MCU4;

[0033] The auxiliary source module includes: a signal MOS1 tube 5 and an electronic switch 6;

[0034] The anode of the diode D2 is electrically connected to the positive terminal of the battery through the pin Vbat, and the cathode of the diode D2 is electrically connected to the cathode of the voltage regulator tube D4 through the resistor R1;

[0035] The cathode of the diode D2 is also electrically connected to the cathode of the voltage regulator tube Q2;

[0036] A resistor R6 is connected in parallel to both ends of the voltage regulator tube Q2, a capacitor C3 is connected in parallel to both ends of the resistor R6, both ends of the capacitor C3 are electrically connected to the power MOS tube 1, and the power MOS tube 1 is electrically connected to the pin Vout;

[0037] The base of the transistor Q1 is electrically connected to the wire between the resistor R1 and the voltage regulator D4, the collector of the transistor Q1 is connected to one end of the resistor R6 through the resistor R5, the emitter of the transistor Q1 is connected to the MCU through the resistor R9, and when the switch S1 is closed, the MCU can detect whether there is a current signal in the circuit, and the emitter of the transistor Q1 is also electrically connected to the anode of the diode D3;

[0038] The base of the transistor Q1 is electrically connected to the emitter of the transistor Q1 via a resistor R4, and the base of the transistor Q1 is also electrically connected to the emitter of the transistor Q1 via a capacitor C2, the capacitor C2 is connected in parallel with the resistor R4, and the capacitor C2 is arranged close to the transistor Q1;

[0039] The anode of the diode D3 is respectively connected to the signal detection module, the emitter of the transistor Q1, the resistor R4 and the capacitor C2, the cathode of the diode D3 is connected to one end of the TVS tube D1, and the other end of the TVS tube D1 is grounded;

[0040] The switch S1 is connected to one end of the common mode inductor L1, and the other end of the common mode inductor L1 is connected in parallel to the TVS tube D1;

[0041] The drain of the signal MOS1 tube 5 is electrically connected to the anode of the diode D3, the source of the signal MOS1 tube 5 is connected to the gate of the signal MOS1 tube 5 via a resistor R2, and the source of the signal MOS1 tube 5 is grounded;

[0042] The two ends of the resistor R2 are connected in parallel with a capacitor C1;

[0043] The gate of the signal MOS tube 5 is connected to the electronic switch 6 via a resistor R8.

[0044] Among them, the main invention of this scheme is that when the power supply needs to be started off the grid, the system can realize the initial power-on and off-grid startup command. When the entire system is not powered on, the switch S13s is pressed continuously to draw power from the battery to supply power to the auxiliary source. Then the system detects the time when the button S1 is pressed to turn on the auxiliary source and enter the off-grid working mode to achieve black start.

[0045] The implementation method is: when the entire system is not powered on, press switch S1 to draw power from the battery to power the circuit for the first time to achieve black start. When the main control system has power and detects that switch S1 is pressed for more than 3s, the main control system will send a signal MOS1 tube 5 closing signal and enter the off-grid working mode, thereby achieving power supply black start. The specific working principle is as follows:

[0046] Vbat is connected to the battery. Because the switch S1 is not pressed and the main control MCU has no electrical signal, MOS1 tube 5 is disconnected. The base voltage of transistor Q1 is clamped by the voltage regulator D4 to the same voltage value as HOLDTEST. Transistor Q1 is not turned on, so the gate and source voltage of PMOSU1 of power MOS tube 1 has no voltage difference and is not turned on, and Vout has no output.

[0047] When switch S1 is pressed, the emitter of transistor Q1 is pulled down through diode D3 and switch S1, which is lower than the clamping voltage of voltage regulator D4. Current flows through the base of transistor Q1, and the transistor is turned on. The gate of PMOSU1 is divided by resistors R5 and R6 to make the gate voltage less than the source voltage of power MOS tube 1, so that U1 is turned on, Vout has output, and the main control system power is established. When the main control MCU detects that the HOLDTEST voltage is 0.7V of the diode D3 voltage drop and lasts for more than 3s, it is considered that the black start button is pressed, and the signal of OFF_POWER (electronic switch 6) is set high, and MOS1 (signal MOS1 tube 5) is turned on. At this time, the power supply is powered on and enters the off-grid working mode, thereby realizing black start.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power supply black start circuit, characterized in that: include: Power extraction module, power supply module, signal detection module and auxiliary source module; The power supply module is respectively connected to the power taking module, the signal detection module and the auxiliary source module; The power taking module is used to take power from the power supply module. Meanwhile, the signal detection module is used to detect whether the power taking module is in a startup state. The auxiliary source module is used to receive the current delivered by the power supply module when the power taking module is in a startup state.

2. The power supply black start circuit according to claim 1, characterized in that: The power supply module includes: a diode D2, a voltage regulator Q2, a power MOS tube, a voltage regulator D4 and a transistor Q1; The anode of the diode D2 is electrically connected to the positive terminal of the battery through the pin Vbat, and the cathode of the diode D2 is electrically connected to the cathode of the voltage regulator tube D4 through the resistor R1; The cathode of the diode D2 is also electrically connected to the cathode of the voltage regulator tube Q2; A resistor R6 is connected in parallel to both ends of the voltage regulator tube Q2, a capacitor C3 is connected in parallel to both ends of the resistor R6, both ends of the capacitor C3 are electrically connected to the power MOS tube, and the power MOS tube is electrically connected to the pin Vout; The base of the transistor Q1 is electrically connected to the wire between the resistor R1 and the voltage regulator D4, the collector of the transistor Q1 is connected to one end of the resistor R6 through the resistor R5, and the emitter of the transistor Q1 is connected to the power taking module and the signal detection module respectively; The base of the transistor Q1 and the emitter of the transistor Q1 are electrically connected via a resistor R4, and the base of the transistor Q1 and the emitter of the transistor Q1 are also electrically connected via a capacitor C2, the capacitor C2 is connected in parallel with the resistor R4, and the capacitor C2 is arranged close to the transistor Q1.

3. The power black start circuit according to claim 2, characterized in that: The power taking module includes: a switch S1, a common mode inductor L1, a TVS tube D1 and a diode D3; The anode of the diode D3 is respectively connected to the signal detection module, the emitter of the transistor Q1, the resistor R4 and the capacitor C2, the cathode of the diode D3 is connected to one end of the TVS tube D1, and the other end of the TVS tube D1 is grounded; The switch S1 is connected to one end of the common-mode inductor L1 , and the other end of the common-mode inductor L1 is connected in parallel to the TVS tube D1 .

4. The power supply black start circuit according to claim 3, characterized in that: The signal detection module includes: a resistor R9 and an MCU; The emitter of the transistor Q1 is connected to the MCU via the resistor R9. When the switch S1 is closed, the MCU can detect whether there is a voltage signal in the circuit.

5. The power supply black start circuit according to claim 4, characterized in that: The auxiliary source module includes: a signal MOS1 tube and an electronic switch; The drain of the signal MOS1 tube is electrically connected to the anode of the diode D3, the source of the signal MOS1 tube is connected to the gate of the signal MOS1 tube via a resistor R2, and the source of the signal MOS1 tube is grounded; The two ends of the resistor R2 are connected in parallel with a capacitor C1; The gate of the signal MOS1 tube is connected to the electronic switch through a resistor R8.

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