A battery powered circuit

Abstract

This invention provides a battery-powered circuit for powering an FTU device that draws power from a DC pole. The circuit comprises an FTU device and an energy storage port. The FTU device is powered by DC power supplies from both sides of the pole, which are a first DC power supply and a second DC power supply, respectively. It includes a selection circuit for selecting the DC power supply, a pre-charging circuit for charging the energy storage capacitor, and a main battery charging / discharging circuit for charging the main battery using the energy from the pre-charging circuit. This allows for long-term operation of the FTU device, eliminating the need for a power supply PT device, simplifying installation, deployment, and debugging. It also allows for opening and closing operations of the pole-mounted circuit breaker at any time after startup, ensuring complete maintenance-free operation for 8-10 years.

Description

Technical Field

[0001] This invention relates to communication in power equipment, and more particularly to a circuit for battery power supply. Background Technology

[0002] State Grid standardized switchgear (FTU) devices typically employ external dual power supply units (PTs). Power supply PTs are installed on both the incoming and outgoing lines, drawing 220VAC power from a 10kV:220V PT to power the FTU's load output port. Traditional PT power supply methods require additional PTs to be installed next to the 10kV pole-mounted circuit breaker. Our company has begun researching embedding voltage dividers within the poles to directly draw power from the 10kV pole-mounted circuit breaker. This embedded voltage divider reduces the need for additional PTs, lowers overall costs, and improves on-site installation efficiency. Summary of the Invention

[0003] Compared to traditional PT power supply, the DC power extraction scheme with embedded capacitors in the pole piece is limited by the size of the pole-mounted switch body, resulting in relatively lower output power. The maximum measured power extraction is approximately 8W, and the voltage extraction can be maintained at 29Vdc±1% under a load ≤8W. This is because the FTU device's load output port requires a transient power output of 200-300W for less than 50ms during opening and closing operations to drive the solenoid valve and complete the switch operation. After the operation, a 150W-200W energy storage motor needs to be driven for 8-10 seconds to complete the energy storage operation. Without a backup power supply, the 8W power obtained from the extraction port is insufficient for both the operation and energy storage. Therefore, a more comprehensive backup power management system needs to be developed to compensate for the low output power of the pole piece power extraction.

[0004] To address the aforementioned problems, this invention provides a circuit for battery power supply, applied to the load output port of an FTU device that draws power from a DC pole. The circuit is characterized in that it includes an FTU device load output port and an energy storage load output port. The FTU device load output port is powered by DC power supplies from both sides of the pole, and the DC power supplies from both sides are a first DC power supply and a second DC power supply, respectively.

[0005] The circuit also includes,

[0006] The selection circuit has its input terminals connected to the output terminals of the DC power supplies on both sides, and the output terminal of the selection power supply is connected to the input terminal of a pre-charging circuit. The selection circuit is used to select the DC power supply with the higher voltage to power the pre-charging circuit.

[0007] A pre-charging circuit includes an energy storage capacitor. The output terminal of the pre-charging circuit is connected to the input terminal of a main battery charging and discharging circuit and the input terminal of a secondary battery charging circuit, respectively, for charging the energy storage capacitor to supply power to the main battery charging and discharging circuit and the secondary battery charging circuit.

[0008] The main battery charging and discharging circuit includes a main battery. The output terminal of the main battery charging and discharging circuit is connected to the load output port of the FTU device. It is used to charge the main battery with the power of the pre-charging circuit and to supply power to the load output port of the FTU device through the main battery.

[0009] Preferably, it also includes a battery charging circuit and a main battery activation circuit.

[0010] The auxiliary battery charging circuit includes an auxiliary battery. The input terminal of the auxiliary battery charging circuit is connected to the output terminal of the main battery charging and discharging circuit. The output terminal of the auxiliary battery charging circuit is connected to the energy storage load output port for charging the auxiliary battery. The auxiliary battery is used to supply power to the energy storage load output port, and the energy storage load output port is used to supply power to a spring-loaded device.

[0011] The input terminal of the main battery activation circuit is connected to a microcontroller, and the output terminal of the main battery activation circuit is connected to the selection circuit. The selection circuit is used to control the main battery to discharge and charge in order to activate the main battery according to the control of the microcontroller.

[0012] Preferably, the selection circuit includes:

[0013] The first selection branch includes a first diode, the positive terminal of the first diode is used as the input terminal of the first selection branch and connected to the positive terminal of the first DC power supply, the negative terminal of the first diode is used as the output terminal of the first selection branch, and the negative terminal of the first DC power supply is grounded.

[0014] The second selection branch includes a second diode. The positive terminal of the second diode serves as the input terminal of the second selection branch and is connected to the positive terminal of the second DC power supply. The negative terminal of the second diode serves as the output terminal of the second selection branch, and the negative terminal of the second DC power supply is grounded.

[0015] Preferably, one plate of the energy storage capacitor is connected to the relay, and the other plate is grounded;

[0016] The pre-charging circuit first pre-charges the energy storage capacitor, and then supplies power to the main battery charging and discharging circuit after the voltage of the energy storage capacitor reaches a first preset voltage.

[0017] Preferably, the positive terminal of the main battery is connected to the positive terminal of a third diode, and the negative terminal of the main battery is grounded. When both the first DC power supply and the second DC power supply are de-energized, the main battery supplies power to the load output port of the FTU device through a fourth diode.

[0018] Preferably, it also includes a trickle charging module, the input end of which serves as the output end of the main battery charging and discharging circuit and is connected to the first node;

[0019] The output terminal of the trickle charging module is connected to a resistor;

[0020] The adjustment terminal of the trickle charging module is connected between the resistor and the positive terminal of the main battery. Through feedback adjustment of the adjustment terminal, the voltage between the output terminal and the adjustment terminal of the trickle charging module is kept constant, thereby keeping the output current of the trickle charging module constant.

[0021] Preferably, when the voltage of the secondary battery is insufficient to supply power, the main battery replenishes the power of the secondary battery through the third diode to maintain a stable output voltage of the secondary battery.

[0022] Preferably, the microcontroller internally sets an activation voltage value and presets a fixed time parameter.

[0023] By periodically controlling the relay to disconnect using the fixed time parameter, the main battery discharges through the load output port of the FTU device;

[0024] The microcontroller measures the current voltage of the main battery through a sampling port. When it detects that the current voltage of the main battery is lower than the activation voltage value, it closes the relay again to recharge the main battery.

[0025] Preferably, the spring-operated device is powered by the auxiliary battery to complete its operation, and the auxiliary battery stops discharging after it has finished powering the spring-operated device.

[0026] Beneficial effects: It can meet the load output port operation of FTU device for a long time, eliminate the need for power supply PT device, simplify the difficulty of installation, deployment and commissioning, and can complete the opening and closing operation of pole-mounted circuit breaker at any time after power-on, ensuring long-term complete maintenance-free operation. Attached Figure Description

[0027] Figure 1 A circuit diagram for battery power supply in a preferred embodiment of the present invention; Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within the scope of the present invention.

[0029] In a preferred embodiment of the present invention, to address the aforementioned problems in the prior art, a circuit for battery power supply is provided, applied to power the load output port 1 of an FTU device with DC power drawn from the electrode post, characterized in that, as Figure 1 As shown, the circuit includes an FTU device load output port 1 and an energy storage load output port 2. The FTU device load output port 1 is powered by DC power supplies on both sides of the pole, which are the first DC power supply and the second DC power supply, respectively.

[0030] The circuit also includes,

[0031] The selection circuit has its input terminals connected to the output terminals of the DC power supplies on both sides. The output terminals of the selected power supplies are connected to the input terminals of a pre-charging circuit. The selection circuit is used to select a DC power supply with a higher voltage to power the pre-charging circuit.

[0032] The pre-charging circuit includes an energy storage capacitor. The output terminal of the pre-charging circuit is connected to the input terminal of a main battery charging and discharging circuit and the input terminal of a secondary battery charging circuit, respectively, for charging the energy storage capacitor to supply power to the main battery charging and discharging circuit and the secondary battery charging circuit.

[0033] The main battery charging and discharging circuit includes a main battery B1. The output terminal of the main battery charging and discharging circuit is connected to the load output port 1 of the FTU device. It is used to charge the main battery B1 with the power of the pre-charging circuit and to supply power to the load output port 1 of the FTU device through the main battery.

[0034] Specifically, the high-selection circuit is a dual-power selection circuit, with P1 being the power source on the switch input side and P2 being the power source on the switch output side. High selection is achieved through two Schottky diodes, automatically supplying power to the entire device. The FTU device load output port 1 can operate when either side is powered. The main battery charging and discharging circuit is controlled by the microcontroller 3 to achieve automatic charging and discharging of the battery, which can effectively extend the life of the main battery B1.

[0035] In a preferred embodiment of the present invention, it further includes a secondary battery charging circuit and a primary battery activation circuit.

[0036] The auxiliary battery charging circuit includes an auxiliary battery. The input terminal of the auxiliary battery charging circuit is connected to the output terminal of the main battery charging and discharging circuit. The output terminal of the auxiliary battery charging circuit is connected to the energy storage load output port 2 for charging the auxiliary battery. The auxiliary battery is used to supply power to the energy storage load output port 2. The energy storage load output port 2 is used to supply power to a spring-loaded device.

[0037] The input terminal of the main battery activation circuit is connected to a microcontroller 3, and the output terminal of the main battery activation circuit is connected to a selection circuit, which is used to control the main battery to discharge and charge in order to activate the main battery according to the control of the microcontroller 3.

[0038] Specifically, the auxiliary battery does not supply power to the main body of the FTU device load output port 1, but only directly supplies power to the energy storage load output port 2. The load connected to the energy storage load output port 2 will only output power for 8-10 seconds after the opening and closing operation. After the energy storage of the spring-loaded device is completed, the discharge stops. Therefore, the quality of the rechargeable battery at the factory is guaranteed, and the battery charge can be maintained for a long time. After multiple energy storage operations, the voltage of the auxiliary battery drops. The Schottky diode automatically replenishes the charge from the main battery to keep the voltage of the auxiliary battery from being much lower than that of the main battery. The characteristics of the Schottky diode ensure that the auxiliary battery cannot discharge to the main battery.

[0039] In a preferred embodiment of the present invention, the selection circuit includes:

[0040] The first selection branch includes a first diode D1. The positive terminal of the first diode D1 is used as the input terminal of the first selection branch and connected to the positive terminal of the first DC power supply. The negative terminal of the first diode D1 is used as the output terminal of the first selection branch. The negative terminal of the first DC power supply is grounded.

[0041] The second selection branch includes a second diode D2. The positive terminal of the second diode D2 serves as the input terminal of the second selection branch and is connected to the positive terminal of the second DC power supply. The negative terminal of the second diode D2 serves as the output terminal of the second selection branch, and the negative terminal of the second DC power supply is grounded.

[0042] Specifically, the first diode D1 and the second diode D2 are Schottky diodes. Utilizing the characteristics of Schottky diodes, when a forward bias is applied across the Schottky barrier (i.e., the anode metal is connected to the positive terminal of the power supply and the N-type substrate is connected to the negative terminal), the Schottky barrier layer narrows and its internal resistance decreases; conversely, when a reverse bias is applied across the Schottky barrier, the Schottky barrier layer widens and its internal resistance increases. This characteristic allows for the selection of the power supply on both sides.

[0043] In a preferred embodiment of the present invention, one plate of the energy storage capacitor is connected to a relay, and the other plate is grounded;

[0044] The pre-charge circuit first pre-charges the energy storage capacitor, and then supplies power to the main battery charging and discharging circuit after the voltage of the energy storage capacitor reaches a first preset voltage.

[0045] Specifically, after passing through the high-voltage selection circuit, the power supplies on both sides precharge the energy storage capacitor C1 through the normally closed contact of the activation management relay T1. When the precharge voltage of the energy storage capacitor C1 exceeds 16V, the FTU equipment can start and run normally.

[0046] In a preferred embodiment of the present invention, the positive terminal of the main battery is connected to the positive terminal of a third diode D3, and the negative terminal of the main battery is grounded. When both the first DC power supply and the second DC power supply are de-energized, the main battery supplies power to the load output port 1 of the FTU device through a fourth diode D4.

[0047] Specifically, when the voltage of the energy storage capacitor C1 exceeds the voltage of the main battery B1 by +1.25V, the trickle charging module 4 starts to charge the main battery B1 at a constant current. The trickle charging ends when the voltage of the main battery B1 is less than the supply voltage of -1.25V. At this time, the main battery B1 will maintain a constant voltage state and will no longer charge or discharge. When both power supplies lose power at the same time, the main battery B1 supplies power to the load output port 1 of the FTU device through the third diode D3 until the main power battery is completely discharged, and then the FTU will power off. When the power supplies on both sides are restored, the charge of the main battery B1 gradually increases slowly.

[0048] In a preferred embodiment of the present invention, a trickle charging module 4 is further included, wherein the input terminal of the trickle charging module 4 serves as the output terminal of the main battery charging and discharging circuit and is connected to the first node.

[0049] A resistor is connected to the output terminal of trickle charging module 4;

[0050] The adjustment terminal of the trickle charging module 4 is connected between the resistor and the positive terminal of the main battery. Through the feedback adjustment of the adjustment terminal, the voltage between the output terminal and the adjustment terminal of the trickle charging module 4 is kept constant, thereby keeping the output current of the trickle charging module 4 constant.

[0051] Specifically, when the load resistance decreases, the current connected to the resistor at the output terminal will increase accordingly. This will force the voltage across the resistor to rise. Once the voltage exceeds a fixed value, the regulating terminal will provide feedback. Because it is necessary to ensure that the voltage across the resistor is maintained at a fixed value, according to Ohm's law, I = U / R. Therefore, the output current will remain unchanged when it rises to the output terminal, thus achieving constant current output.

[0052] In a preferred embodiment of the present invention, when the voltage of the secondary battery is insufficient to supply power, the main battery replenishes the power of the secondary battery through the third diode D3 to maintain a stable output voltage of the secondary battery.

[0053] Specifically, after multiple energy storage operations, when the voltage of the secondary battery B2 falls below a certain threshold, the secondary battery B2 will automatically retain its charge from the main battery B1 through a Schottky diode, ensuring that the battery voltage of the secondary battery B2 will always be no less than the voltage of the main battery B1 by 360Vmv. At the same time, the Schottky diode can also prevent the secondary battery B2 from discharging into the main battery B1.

[0054] In a preferred embodiment of the present invention, the microcontroller 3 internally sets an activation voltage value and presets a fixed time parameter.

[0055] By periodically controlling the relay to disconnect with fixed time parameters, the main battery discharges through the load output port 1 of the FTU device.

[0056] The microcontroller 3 measures the current voltage of the main battery through a sampling port. When it detects that the current voltage of the main battery is lower than the activation voltage, it closes the relay again to recharge the main battery.

[0057] Specifically, the activation voltage value is stored in the microcontroller 3. The microcontroller 3 issues commands to control the relay T1, which can open and close the circuit to control the charging and discharging of the main battery B1. This avoids the battery electrodes from aging rapidly due to prolonged constant voltage trickle charging. The microcontroller 3 can also control the relay T1 by judging and setting a preset time period. The microcontroller 3 collects the current voltage of the main battery B1 and the pre-charging voltage of the energy storage capacitor C1. If the pre-charging voltage exceeds 16V, it starts supplying power to the FTU. If the pre-charging voltage is greater than 1.25V of the main battery B1 voltage, it starts the trickle charging module 4 and triggers the shutdown function through a preset time to ensure that the main battery B1 voltage is in an activated state and extend its service life.

[0058] Charge-discharge activation can effectively improve the lifespan and effective capacity of the main battery.

[0059] In a preferred embodiment of the present invention, the ballistic control device is powered by a secondary battery to complete the operation, and the secondary battery stops discharging after it has finished powering the ballistic control device.

[0060] Specifically, the auxiliary battery B2 does not supply power to the FTU itself. Instead, it directly supplies power to the energy storage load output port 2. This is because the energy storage load only outputs power for 8-10 seconds when the ballistic device is activated. Once the ballistic device finishes storing energy, the auxiliary battery B2 will stop discharging. Therefore, ensuring that the battery is fully charged at the factory is sufficient to maintain its charge level.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present invention.

Claims

1. A battery-powered circuit for use in a FTU device load output port power supply for a pole DC power take, characterized in that, The circuit includes an FTU device load output port and an energy storage load output port. The FTU device load output port is powered by DC power supplies on both sides of the pole, which are a first DC power supply and a second DC power supply, respectively. The circuit also includes, The selection circuit has its input terminals connected to the output terminals of the DC power supplies on both sides, and its output terminal connected to the input terminal of a pre-charging circuit. The selection circuit is used to select the DC power supply with the higher voltage to power the pre-charging circuit. A pre-charging circuit includes an energy storage capacitor. The output terminal of the pre-charging circuit is connected to the input terminal of a main battery charging and discharging circuit and the input terminal of a secondary battery charging circuit, respectively, for charging the energy storage capacitor to supply power to the main battery charging and discharging circuit and the secondary battery charging circuit. The main battery charging and discharging circuit includes a main battery. The output terminal of the main battery charging and discharging circuit is connected to the load output port of the FTU device. It is used to charge the main battery with the power of the pre-charging circuit and to supply power to the load output port of the FTU device through the main battery.

2. A circuit for battery operation as claimed in claim 1, characterized in that, It also includes a battery charging circuit and a main battery activation circuit. The auxiliary battery charging circuit includes an auxiliary battery. The input terminal of the auxiliary battery charging circuit is connected to the output terminal of the main battery charging and discharging circuit. The output terminal of the auxiliary battery charging circuit is connected to the energy storage load output port for charging the auxiliary battery. The auxiliary battery is used to supply power to the energy storage load output port, and the energy storage load output port is used to supply power to a spring-loaded device. The input terminal of the main battery activation circuit is connected to a microcontroller, and the output terminal of the main battery activation circuit is connected to the selection circuit. The selection circuit is used to control the main battery to discharge and charge in order to activate the main battery according to the control of the microcontroller.

3. A circuit for battery operation as claimed in claim 1, wherein, The selection circuit includes: The first selection branch includes a first diode, the positive terminal of the first diode is used as the input terminal of the first selection branch and connected to the positive terminal of the first DC power supply, the negative terminal of the first diode is used as the output terminal of the first selection branch, and the negative terminal of the first DC power supply is grounded. The second selection branch includes a second diode. The positive terminal of the second diode serves as the input terminal of the second selection branch and is connected to the positive terminal of the second DC power supply. The negative terminal of the second diode serves as the output terminal of the second selection branch, and the negative terminal of the second DC power supply is grounded.

4. A circuit for battery operation as claimed in claim 1, wherein, One plate of the energy storage capacitor is connected to the relay, and the other plate is grounded; The pre-charging circuit first pre-charges the energy storage capacitor, and then supplies power to the main battery charging and discharging circuit after the voltage of the energy storage capacitor reaches a first preset voltage.

5. A circuit for battery operation as claimed in claim 2, wherein, The positive terminal of the main battery is connected to the positive terminal of a third diode, and the negative terminal of the main battery is grounded. When both the first DC power supply and the second DC power supply are de-energized, the main battery supplies power to the load output port of the FTU device through a fourth diode.

6. A circuit for battery power supply as described in claim 1, characterized in that, It also includes a trickle charging module, the input of which serves as the output of the main battery charging and discharging circuit and is connected to the first node; The output terminal of the trickle charging module is connected to a resistor; The adjustment terminal of the trickle charging module is connected between the resistor and the positive terminal of the main battery. Through feedback adjustment of the adjustment terminal, the voltage between the output terminal and the adjustment terminal of the trickle charging module is kept constant, thereby keeping the output voltage of the trickle charging module constant.

7. A circuit for battery power supply as described in claim 2, characterized in that, When the voltage of the secondary battery is insufficient to provide power, the main battery replenishes the power of the secondary battery through the third diode to maintain a stable output voltage of the secondary battery.

8. A circuit for battery power supply as described in claim 2, characterized in that, The microcontroller has an internally set activation voltage value and a preset fixed time parameter. The main battery discharges through the FTU device load output port by periodically controlling the relay to disconnect by the fixed time parameter. The microcontroller measures the current voltage of the main battery through a sampling port. When it detects that the current voltage of the main battery is lower than the activation voltage value, it closes the relay again to recharge the main battery.

9. A circuit for battery power supply as described in claim 2, characterized in that, The spring-operated device is powered by the auxiliary battery to complete its operation. Once the auxiliary battery has finished powering the spring-operated device, it stops discharging.

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