A circuit for disconnecting the power supply of the device when charging the battery and resetting after the battery charging is disconnected

Abstract

This circuit, belonging to the field of electronic circuit technology, disconnects the power supply to the device while charging the battery and resets after charging is disconnected. It addresses the problem of the charging cable breaking due to device movement during charging. The circuit includes: a charger, a battery, an electronic switch, a power-on signal unit, and a signal processing unit. The input terminals of the charger and the power-on signal unit are connected to an external power input terminal. The charger, battery, and electronic switch are connected sequentially, with the output terminal of the electronic switch connected to the device. The power-on signal unit, signal processing unit, and electronic switch are also connected sequentially. When power is on, the power-on signal unit sends a power-on signal to disconnect the electronic switch, allowing the charger to charge the battery. When power is off, the power-on signal unit sends no signal, causing the electronic switch to turn on, allowing the battery to supply power to the device. The beneficial effect of this invention is that it prevents the device from starting and operating without unplugging the charger during charging, avoiding unnecessary problems such as broken charging cables.

Description

Technical Field

[0001] This invention belongs to the field of electronic circuit technology, specifically relating to a circuit that disconnects the power supply to the device when charging the battery and resets after disconnecting the battery from charging. Background Technology

[0002] Most existing mobile devices are powered by rechargeable batteries, such as golf carts, sightseeing vehicles, toy cars, and electric wheelchairs. They need to be charged after a period of use. During the charging process, users often forget to unplug the charger before starting the device, which can cause the charging cable to break during movement, resulting in damage, leakage, and other unnecessary troubles. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a circuit that disconnects the device's power supply while charging the battery and resets the device after disconnecting the battery from charging. This prevents unnecessary problems such as the charging cable breaking if the device starts operating without unplugging the charger during the charging process.

[0004] The present invention adopts the following technical solution:

[0005] The circuit that disconnects the device power supply when charging the battery and resets after disconnecting the battery charging includes: a charger, a battery, an electronic switch, a power-on signal unit, and a signal processing unit;

[0006] The charger and the input terminal of the power-on signal unit are connected to an external power input terminal. The charger, battery, and electronic switch are connected in sequence. The output terminal of the electronic switch is connected to the electrical equipment. The power-on signal unit, signal processing unit, and electronic switch are connected in sequence.

[0007] The signal processing unit processes the signal emitted by the power-on signal unit. When the power is on, the power-on signal unit emits a power-on signal to disconnect the electronic switch and allow the charger to charge the battery. When the power is off, the power-on signal unit emits no signal and allows the electronic switch to turn on, allowing the battery to supply power to the electrical device.

[0008] Optionally, the charger is connected to the positive and negative terminals of the battery. The charger includes a transformer winding T1a, a diode DL1, and an electrolytic capacitor EC3. The transformer winding T1a is connected in series with the diode DL1 and the electrolytic capacitor EC3. The diode DL1 and the electrolytic capacitor EC3 rectify and filter the external power input connected to the transformer winding T1a.

[0009] Optionally, the energizing signal unit includes a transformer winding T1b, wherein the transformer winding T1b and the transformer winding T1a are connected to the same external power input.

[0010] Optionally, the signal processing unit includes a diode DL2, a resistor R36, and an electrolytic capacitor EC5, wherein the diode DL2, the resistor R36, and the electrolytic capacitor EC5 are connected in series to rectify and filter the external power input connected to the transformer winding T1b.

[0011] Optionally, the electronic switch includes: diode D11, resistors R14 and R15, transistor Q6, resistors R22, R28, R29, R55, R44, PMOS transistor Q21, and transistor Q5. The input terminal of resistor R14 is connected to the signal processing unit. The output terminal of resistor R14 and the input terminal of resistor R15 are both connected to the base terminal (B) of transistor Q6. The positive terminal of the battery is connected to the input terminal of diode D11, the input terminal of resistor R55, and the source terminal (S) of PMOS transistor Q21. The drain terminal (D) of PMOS transistor Q21 is connected to the positive terminal of the electrical device. The output terminal of transistor D11 is connected to the input terminal of resistor R22. The output terminal of resistor R22 is connected to the collector (C) terminal of transistor Q6 and the input terminal of resistor R28. The output terminal of resistor R28 is connected to the base (B) terminal of transistor Q5 and the input terminal of resistor R29. The output terminal of resistor R55 is connected to the gate (G) terminal of PMOS transistor Q21 and the input terminal of resistor R44. The output terminal of resistor R44 is connected to the collector (C) terminal of transistor Q5. The negative terminal of the battery, the output terminal of resistor R15, the emitter (E) terminal of transistor Q6, the output terminal of resistor R29, and the emitter (E) terminal of transistor Q5 are all connected to the negative terminal of the electrical equipment.

[0012] The beneficial effect of this invention is that the device cannot operate without power during the charging process. After the charging is disconnected, the battery powers the device to operate, which can prevent the device from starting and running without disconnecting the charging during the charging process and avoid unnecessary troubles such as breaking the charging cable. Attached Figure Description

[0013] Figure 1 This is a structural block diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the circuit structure of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0016] Example 1:

[0017] like Figure 1As shown, the circuit that disconnects the device power supply when charging the battery and resets after disconnecting the battery charging includes: a charger, a battery, an electronic switch, a power-on signal unit, and a signal processing unit;

[0018] The charger and the input terminal of the power-on signal unit are connected to an external power input terminal. The charger, battery, and electronic switch are connected in sequence. The output terminal of the electronic switch is connected to the electrical equipment. The power-on signal unit, signal processing unit, and electronic switch are connected in sequence.

[0019] The signal processing unit processes the signal emitted by the power-on signal unit. When the power is on, the power-on signal unit emits a power-on signal to disconnect the electronic switch and allow the charger to charge the battery. When the power is off, the power-on signal unit emits no signal and allows the electronic switch to turn on, allowing the battery to supply power to the electrical device.

[0020] like Figure 2 As shown, the charger is connected to the positive and negative terminals of the battery. The charger includes a transformer winding T1a, a diode DL1, and an electrolytic capacitor EC3. The transformer winding T1a is connected in series with the diode DL1 and the electrolytic capacitor EC3. The diode DL1 and the electrolytic capacitor EC3 rectify and filter the external power input connected to the transformer winding T1a.

[0021] like Figure 2 As shown, the power-on signal unit includes a transformer winding T1b, which is connected to the same external power input as the transformer winding T1a.

[0022] like Figure 2 As shown, the signal processing unit includes a diode DL2, a resistor R36, and an electrolytic capacitor EC5. The diode DL2, resistor R36, and electrolytic capacitor EC5 are connected in series to rectify and filter the external power input connected to the transformer winding T1b.

[0023] like Figure 2As shown, the electronic switch includes: diode D11, resistors R14 and R15, transistor Q6, resistors R22, R28, R29, R55, R44, PMOS transistor Q21, and transistor Q5. The input terminal of resistor R14 is connected to the signal processing unit. The output terminal of resistor R14 and the input terminal of resistor R15 are both connected to the base (B) terminal of transistor Q6. The positive terminal of the battery is connected to the input terminal of diode D11, the input terminal of resistor R55, and the source (S) terminal of PMOS transistor Q21. The drain (D) terminal of PMOS transistor Q21 is connected to the positive terminal of the electrical device. The output terminal of transistor D11 is connected to the input terminal of resistor R22. The output terminal of resistor R22 is connected to the collector (C) terminal of transistor Q6 and the input terminal of resistor R28. The output terminal of resistor R28 is connected to the base (B) terminal of transistor Q5 and the input terminal of resistor R29. The output terminal of resistor R55 is connected to the gate (G) terminal of PMOS transistor Q21 and the input terminal of resistor R44. The output terminal of resistor R44 is connected to the collector (C) terminal of transistor Q5. The negative terminal of the battery, the output terminal of resistor R15, the emitter (E) terminal of transistor Q6, the output terminal of resistor R29, and the emitter (E) terminal of transistor Q5 are all connected to the negative terminal of the electrical equipment.

[0024] During use, when the charger is connected to an external power source, the transformer winding T1a, diode DL1, and electrolytic capacitor EC3 rectify and filter the output to charge the battery. The transformer winding T1b of the power-on signal unit is energized, and the diode DL2, resistor R36, and electrolytic capacitor EC5 rectify and filter to form a power-on signal. This signal is then divided by resistors R14 and R15 to drive transistor Q6 to conduct, pulling down the potential at the junction of resistors R22 and R28. At this time, transistor Q5 has no driving signal and does not conduct. Therefore, resistors R55 and R44 do not form a circuit to the negative terminal, and the voltage across resistor R55 is the same, meaning the potentials of the S and G pins of PMOS transistor Q21 are the same. This does not meet the conditions for P-MOSFETs to conduct, so PMOS transistor Q21 does not conduct and the device is powered off.

[0025] When the charger is unplugged, there is no energy to maintain the rectification and filtering output of transformer winding T1a, diode DL1, and electrolytic capacitor EC3 to charge the battery. At the same time, there is no energy to maintain the rectification and filtering output of another transformer winding T1b, diode DL2, resistor R36, and electrolytic capacitor EC5 to form a power-on signal. At this time, there is no voltage across resistors R14 and R15, and transistor Q6 is not conducting. The voltage on the battery is divided by diode D11, resistors R22, R28, and R29 to drive transistor Q5 to conduct, so that resistors R55 and R44 form a circuit with the negative terminal. Then the potential of the junction of resistors R55 and R44 is pulled low, that is, the potential of the gate (G) pin of PMOS transistor Q21 is lower than the potential of the source (S) pin, which meets the condition for P-MOSFETs to conduct. PMOS transistor Q21 conducts to supply power to the device.

[0026] The beneficial effect of this invention is that the device cannot operate without power during the charging process. After the charging is disconnected, the battery powers the device to operate, which can prevent the device from starting and running without disconnecting the charging during the charging process and avoid unnecessary troubles such as breaking the charging cable.

Claims

1. A circuit that disconnects the device power supply while charging the battery and resets after disconnecting the battery charging, characterized in that, include: Charger, battery, electronic switch, power-on signal unit, and signal processing unit; The charger and the input terminal of the power-on signal unit are connected to an external power input terminal. The charger, battery, and electronic switch are connected in sequence. The output terminal of the electronic switch is connected to the electrical equipment. The power-on signal unit, signal processing unit, and electronic switch are connected in sequence. The signal processing unit processes the signal emitted by the power-on signal unit. When the power is on, the power-on signal unit emits a power-on signal to disconnect the electronic switch and allow the charger to charge the battery. When the power is off, the power-on signal unit emits no signal and allows the electronic switch to turn on, enabling the battery to power the electrical device. The charger is connected to the positive and negative terminals of the battery. The charger includes a transformer winding T1a, a diode DL1, and an electrolytic capacitor EC3. The transformer winding T1a is connected in series with the diode DL1 and the electrolytic capacitor EC3. The diode DL1 and the electrolytic capacitor EC3 rectify and filter the external power input connected to the transformer winding T1a. The energizing signal unit includes: a transformer winding T1b, wherein the transformer winding T1b and the transformer winding T1a are connected to the same external power input; The electronic switch includes: diode D11, resistors R14 and R15, transistor Q6, resistors R22, R28, R29, R55, R44, PMOS transistor Q21, and transistor Q5. The input terminal of resistor R14 is connected to the signal processing unit. The output terminal of resistor R14 and the input terminal of resistor R15 are both connected to the base (B) terminal of transistor Q6. The positive terminal of the battery is connected to the input terminal of diode D11, the input terminal of resistor R55, and the source (S) terminal of PMOS transistor Q21. The drain (D) terminal of PMOS transistor Q21 is connected to the positive terminal of the electrical device. The output terminal of D11 is connected to the input terminal of resistor R22. The output terminal of resistor R22 is connected to the collector (C) terminal of transistor Q6 and the input terminal of resistor R28. The output terminal of resistor R28 is connected to the base (B) terminal of transistor Q5 and the input terminal of resistor R29. The output terminal of resistor R55 is connected to the gate (G) terminal of PMOS transistor Q21 and the input terminal of resistor R44. The output terminal of resistor R44 is connected to the collector (C) terminal of transistor Q5. The negative terminal of the battery, the output terminal of resistor R15, the emitter (E) terminal of transistor Q6, the output terminal of resistor R29, and the emitter (E) terminal of transistor Q5 are all connected to the negative terminal of the electrical equipment. When the charger is connected to an external power source, the transformer winding T1a, diode DL1, and electrolytic capacitor EC3 rectify and filter the output to charge the battery. The transformer winding T1b of the power-on signal unit is energized, and the diode DL2, resistor R36, and electrolytic capacitor EC5 rectify and filter to form a power-on signal. After being divided by resistors R14 and R15, the transistor Q6 is turned on, which pulls down the potential of the junction of resistors R22 and R28. At this time, the transistor Q5 does not conduct because it has no driving signal. When the charger is unplugged, there is no energy to maintain the rectified and filtered output of transformer winding T1a, diode DL1, and electrolytic capacitor EC3 to charge the battery. At the same time, there is no energy to maintain the rectified and filtered output of another transformer winding T1b, diode DL2, resistor R36, and electrolytic capacitor EC5 to form a power signal. At this time, there is no voltage across resistors R14 and R15, and transistor Q6 is not conducting. The voltage on the battery is divided by diode D11, resistors R22, R28, and R29, which drives transistor Q5 to conduct, making resistors R55 and R44 form a circuit with the negative terminal. Therefore, the potential of the junction of resistors R55 and R44 is pulled low, and PMOS transistor Q21 conducts to supply power to the device.

2. The circuit for disconnecting the device power supply while charging the battery and resetting after disconnecting the battery charging, as described in claim 1, is characterized in that... The signal processing unit includes a diode DL2, a resistor R36, and an electrolytic capacitor EC5. The diode DL2, resistor R36, and electrolytic capacitor EC5 are connected in series to rectify and filter the external power input connected to the transformer winding T1b.

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