TWI711373B - Power supply device - Google Patents

Abstract

A power supply device includes a battery unit, an anti-leakage unit, and a micro-control unit. The battery unit determines whether to charge with a DC input voltage according to a charging control signal. The leakage prevention unit receives a first control signal instructing to read a battery voltage of the battery unit, and generates a battery according to the first control signal. The voltage signal related to the current battery voltage of the battery unit, the micro control unit is used to receive one of the DC input voltage and the battery voltage of the battery unit, and when receiving the DC input voltage, Generate and output the first control signal and receive the voltage signal, generate the charging control signal according to the voltage signal and a preset reference voltage, and output the charging control signal to the battery unit.

Description

Power supply device

The present invention relates to a power supply device, in particular to a power supply device for a rechargeable electric mosquito swatter.

The existing rechargeable electric mosquito swatter mainly includes a lead-acid battery as a power supply device for its internal circuit. However, since the lead-acid battery has no automatic power-off mechanism when fully charged, the lead-acid battery is prone to overcharging during charging, which in turn leads to a shorter service life of the lead-acid battery. Therefore, in order to avoid overcharging of the lead-acid battery, the manufacturer of the rechargeable electric mosquito swatter usually recommends that the user charge the lead-acid battery when it is almost empty. However, the rechargeable electric mosquito swatter does not have the function of displaying the battery power, which makes it difficult for the user to determine when the lead-acid battery is almost dead. In addition, for the lead-acid battery, the nearly dead battery is a deep discharge, which actually shortens the service life of the lead-acid battery. Therefore, there is still room for improvement in the power supply device of the existing rechargeable mosquito swatter.

Therefore, the purpose of the present invention is to provide a power supply device with a longer service life.

Therefore, the power supply device of the present invention includes a battery unit, an anti-leakage unit and a micro-control unit.

The battery unit has a first terminal for receiving one of a DC input voltage and outputting a battery voltage, and also receives a charging control signal. The battery unit decides whether to use the DC input according to the charging control signal. Voltage to charge.

The leakage prevention unit is electrically connected to the battery unit and receives a first control signal instructing to read the battery voltage, and generates a voltage signal related to the current battery voltage of the battery unit according to the first control signal.

The micro-control unit is electrically connected to the battery unit and the anti-leakage unit for receiving one of the DC input voltage and the battery voltage from the first terminal of the battery unit, and the micro-control unit receives When the DC input voltage is used, the first control signal is generated and output to the leakage prevention unit and the voltage signal from the leakage prevention unit is received, and the charging control signal is generated according to the voltage signal and a preset reference voltage, and The charging control signal is output to the battery unit.

The effect of the present invention is that the micro-control unit is used to generate the charging control signal according to the voltage signal and the preset reference voltage to control whether the battery unit is charged according to the DC input voltage, which can prevent the battery unit from overcharging Therefore, the power supply device of the present invention has a longer service life compared with the existing power supply device.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are represented by the same numbers.

1, an embodiment of the power supply device of the present invention is suitable for a rechargeable electric mosquito swatter (not shown), and can be operated in one of a charging mode and a power supply mode, when operating in the charging In the power supply mode, the power supply device is electrically connected to an external power supply (not shown in the figure) to receive the DC input voltage Vi, and charge according to the DC input voltage Vi. When operating in the power supply mode (at this time, in Figure 1 The DC input voltage Vi needs to be omitted), the power supply device provides a DC output voltage Vo according to a battery voltage Vb stored by itself to supply power to a power grid 100 in the rechargeable electric mosquito swatter, and the power supply device It includes a battery unit 1, an anti-leakage unit 2, a micro-control unit 3, a resistor 4, a light-emitting diode 5, and a high-voltage generating unit 6.

The battery unit 1 has a first terminal Q1 for receiving one of the DC input voltage Vi and outputting the battery voltage Vb, and also receives a charging control signal Cha. The battery unit 1 decides whether to charge with the DC input voltage Vi according to the charging control signal Cha. In this embodiment, the battery unit 1 includes a transistor 11, a diode 12, a battery 13, and a switch 14.

The transistor 11 has a first terminal electrically connected to the first terminal Q1 of the battery unit 1, a second terminal, and a control terminal receiving the charging control signal Cha. The diode 12 has an anode electrically connected to the second end of the transistor 11, and a cathode. The battery 13 is electrically connected between the cathode of the diode 12 and the ground, and is used for charging according to the DC input voltage Vi and providing the battery voltage Vb. The switch 14 is electrically connected between the first end of the transistor 11 and the cathode of the diode 12, and is controlled by a switching signal S1 to be conductive or non-conductive. It should be noted that the switch 14 is, for example, a push button switch or a push button switch and a slide switch (slide type) connected in series. The switching signal S1 is related to a user's input operation, but is not limited to this.

The leakage prevention unit 2 is electrically connected to the battery 13 of the battery unit 1, and receives a first control signal C1 instructing to read the battery voltage Vb, and generates a current information related to the battery 13 according to the first control signal C1. The voltage signal Vs of the battery voltage Vb. In this embodiment, the anti-leakage unit 2 can prevent the positive electrode of the battery 13 from being directly electrically connected to the micro-control unit 3 to cause leakage, and the anti-leakage unit 2 includes first and second transistors 21, 22, and The first and second resistors 23,24.

The first transistor 21 has a first terminal electrically connected to the battery 13 of the battery unit 1, a second terminal for providing the voltage signal Vs, and a control terminal. The first resistor 23 is electrically connected between the first terminal and the control terminal of the first transistor 21. The second transistor 22 has a first end that is electrically connected to the control end of the first transistor 21, a second end that is grounded, and a control that is electrically connected to the micro-control unit 3 to receive the first control signal C1 end. The second resistor 24 is electrically connected between the second terminal of the second transistor 22 and the control terminal.

The micro-control unit 3 is electrically connected to the battery unit 1 and the leakage prevention unit 2 for receiving one of the DC input voltage Vi and the battery voltage Vb from the first terminal Q1 of the battery unit 1. When the micro-control unit 3 receives the DC input voltage Vi, it generates and outputs the first control signal C1 to the anti-leakage unit 2 and receives the voltage signal Vs from the anti-leakage unit 2, and according to the voltage signal Vs And a preset reference voltage to generate the charging control signal Cha, and output the charging control signal Cha to the control terminal of the transistor 11 of the battery unit 1. The micro-control unit 3 also generates a second control signal C2 according to one of the DC input voltage Vi and the battery voltage Vb.

The resistor 4 has a first end electrically connected to the micro-control unit 3 and a second end. The light emitting diode 5 has an anode electrically connected to the second end of the resistor 4 and a grounded cathode.

The high-voltage generating unit 6 is electrically connected to the first terminal Q1 of the battery unit 1 and the micro-control unit 3 to receive the battery voltage Vb (or the DC input voltage Vi) and the second control signal C2, respectively. When the high voltage generating unit 6 receives the battery voltage Vb, it generates the DC output voltage Vo according to the battery voltage Vb and the second control signal C2, and outputs the DC output voltage Vo to the power grid 100. In this embodiment, the high-voltage generating unit 6 includes a transformer 61, a capacitor 62, a transistor 63, and a voltage multiplier 64.

The transformer 61 includes a primary winding 611 and a secondary winding 612. Each of the primary and secondary windings 611, 612 has a first end and a second end. The first end of the primary winding 611 is electrically connected to the first end Q1 of the battery unit 1, and is used for receiving one of the direct current input voltage Vi and the battery voltage Vb. When the first terminal of the primary winding 611 receives the battery voltage Vb, the transformer 61 generates a high-voltage output voltage on the secondary winding 612 according to the battery voltage Vb. The capacitor 62 is electrically connected between the first end of the primary winding 611 and the ground. The transistor 63 has a first end electrically connected to the second end of the primary winding 611, a grounded second end, and a control end electrically connected to the micro-control unit 3 to receive the second control signal C2. The voltage multiplier 64 is electrically connected to the first and second ends of the secondary winding 612 to receive the high-voltage output voltage, and generates the DC output voltage Vo according to the high-voltage output voltage.

In detail, when the power supply device of the present invention operates in the charging mode, the switch 14 is not turned on, and the micro control unit 3 receives the DC input voltage Vi and performs the following control: (1) The micro control unit 3 The second control signal C2 generated by the DC input voltage Vi makes the transistor 63 non-conducting; (2) the micro-control unit 3 first outputs the first control signal C1 to make the first and second transistors 21, 22 is turned on to receive the voltage signal Vs from the anti-leakage unit 2, and then generate the charging control signal Cha according to a comparison result obtained by comparing the voltage signal Vs with the preset reference voltage and output it to the transistor 11. For example, when the comparison result is that the voltage signal Vs is less than the preset reference voltage, the transistor 11 is controlled by the charging control signal Cha to turn on, and the battery 13 is charged according to the DC input voltage Vi, When the comparison result is that the voltage signal Vs is not less than the preset reference voltage (for example, the battery 13 is fully charged), the transistor 11 is controlled by the charging control signal Cha and does not turn on, so that the battery 13 no longer continues Charging, thereby preventing the battery 13 from overcharging; and (3) the micro-control unit 3 generates a first driving signal D1 according to the comparison result obtained by comparing the voltage signal Vs with the preset reference voltage and outputs it to the light emitting The diode 5, so that the light-emitting diode 5 blinks and emits light according to the first driving signal D1. For example, when the battery 13 is being charged, the light-emitting diode 5 is controlled by the first drive signal D1 to emit light in a flashing manner every 2 seconds. When the battery 13 is fully charged, the light-emitting diode 5 emits light. The diode 5 is controlled by the first driving signal D1 to emit light in a manner of blinking once every 0.5 seconds, but it is not limited to this. It should be added that the transistor 11 is normally operated in a non-conducting state, but can be controlled by the micro-control unit 3 to be conducting.

In addition, when the power supply device of the present invention operates in the power supply mode, the transistor 11 is not turned on, the switch 14 is turned on, and the micro-control unit 3 receives the battery voltage Vb and performs the following control: (1) the micro-control The unit 3 adjusts the second control signal C2 according to the battery voltage Vb so that the transistor 63 continuously switches between conduction and non-conduction, so that the high-voltage generating unit 6 generates the second control signal C2 according to the battery voltage Vb and the second control signal C2. DC output voltage Vo to supply power to the power grid 100; (2) the micro-control unit 3 adjusts the first control signal C1 to make the second transistor 22 non-conducting; and (3) the micro-control unit 3 according to the battery voltage Vb generates a second driving signal D2 and outputs it to the light emitting diode 5, so that the light emitting diode 5 continues to emit light according to the second driving signal D2.

It should be noted that in this embodiment, the transistor 11 and the first transistor 21 are each, for example, a P-type MOSFET, and the source of the P-type MOSFET , Drain and gate are the first end, the second end and the control end of each transistor 11 and 21 respectively. The transistor 63 and the second transistor 22 are each, for example, an N-type MOSFET, and the drain, source, and gate of the N-type MOSFET are each transistor. The first end, the second end and the control end of the crystals 63 and 22. In addition, using a P-type metal oxide half field effect transistor as the transistor 11 can make the current for charging the battery 13 reach more than 70 mA, so that the charging speed of the battery 13 can be accelerated. In addition, the diode 12 is used to prevent the forward conduction of the diode inside the transistor 11 from causing the battery 13 to form a loop through the micro-control unit 3 to leak electricity, but it is not limited to this, for example, the battery unit 1 and the The implementation of the leakage prevention unit 2 is not limited to that shown in FIG. 1.

For example, referring to FIGS. 2, 3, 4, and 5, FIG. 2 shows another embodiment of the battery unit 1, FIG. 3 shows another embodiment of the battery unit 1, and FIG. 4 shows the Another implementation aspect of the anti-leakage unit 2, and FIG. 5 illustrates yet another implementation aspect of the anti-leakage unit 2.

Referring to FIGS. 1 and 2, the difference between the battery unit 1 of FIG. 2 and the battery unit 1 of FIG. 1 is that a transistor 15 is used to replace the transistor 11 of FIG. 1 and a resistor 16 is added. The transistor 15 has a first terminal electrically connected to the first terminal Q1 of the battery unit 1, a second terminal, and a control terminal electrically connected to the micro-control unit 3 to receive the charging control signal Cha. The resistor 16 has a first end that receives the charging control signal Cha, and a second end that is electrically connected to the control end of the transistor 15. In this embodiment, the transistor 15 is a PNP type bipolar transistor, and the emitter, collector, and base of the PNP type bipolar transistor are the first end and the second end of the transistor 15 respectively. Terminal and the control terminal.

1 and 3, the difference between the battery unit 1 of FIG. 3 and the battery unit 1 of FIG. 1 lies in: replacing the transistor 11 of FIG. 1 with a transistor 17, adding a resistor 18, and omitting FIG. 1 The diode 12. The transistor 17 has a first terminal electrically connected to the first terminal Q1 of the battery unit 1, a second terminal, and a control terminal electrically connected to the micro-control unit 3 to receive the charging control signal Cha. The resistor 18 has a first end that receives the charging control signal Cha, and a second end that is electrically connected to the control end of the transistor 17. The battery 13 is electrically connected between the second end of the transistor 17 and the ground. The switch 14 is electrically connected between the first and second ends of the transistor 17. In this embodiment, the transistor 17 is an NPN type bipolar transistor, and the collector, emitter, and base of the NPN type bipolar transistor are the first end and the second end of the transistor 17 respectively. Terminal and the control terminal. Since the emitter and base of the transistor 17 are NP-reversed, the diode 12 in FIG. 1 can be omitted.

1 and 4, the difference between the anti-leakage unit 2 of FIG. 4 and the anti-leakage unit 2 of FIG. 1 is that the first and second transistors 25, 26 replace the first and second transistors of FIG. 1, respectively Two transistors 21 and 22, and a third resistor 27 is added. The third resistor 27 has a first end electrically connected to the micro-control unit 3 to receive the first control signal C1 and a second end electrically connected to the control end of the second transistor 26. In this embodiment, the first transistor 25 is a PNP type bipolar transistor, and the emitter, collector, and base of the PNP type bipolar transistor are the first ends of the first transistor 25, respectively. , The second end and the control end. The second transistor 26 is an NPN type bipolar transistor, and the collector, emitter, and base of the NPN type bipolar transistor are the first end, the second end, and the second end of the second transistor 26, respectively. The control terminal.

1 and FIG. 5. In FIG. 5, an anti-leakage unit 2'is used to replace the anti-leakage unit 2 of FIG. The leakage prevention unit 2'includes a resistor 28 and a photocoupler 29.

The resistor 28 has a first terminal electrically connected to the micro-control unit 3 to receive the first control signal C1, and a second terminal. The photocoupler 29 includes a light emitting diode 291 and a photoelectric crystal 292. The light emitting diode 291 is electrically connected between the second end of the resistor 28 and the ground. The photoelectric crystal 292 is electrically connected between the battery 13 of the battery unit 1 and the micro-control unit 3 and provides the voltage signal Vs to the micro-control unit 3.

In summary, the power supply device of the present invention uses the micro-control unit 3 to generate the charging control signal Cha according to the voltage signal Vs and the preset reference voltage to control the conduction or non-conduction of the transistor 11, so that the battery 13 is charged When the battery is fully charged, the battery will not continue to be charged (ie, the battery will be automatically powered off when fully charged), thereby preventing the battery 13 from being overcharged and shortening the service life of the battery 13. As a result, the power supply device of the present invention is compared with the existing power supply The device has a long service life.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

100: Grid 1: battery unit 11: Transistor 12: Diode 13: battery 14: switch 15: Transistor 16: resistor 17: Transistor 18: resistor 2, 2’: Leakage-proof unit 21: The first transistor 22: second transistor 23: first resistor 24: second resistor 25: The first transistor 26: second transistor 27: third resistor 28: resistor 29: Optocoupler 291: Light Emitting Diode 292: photoelectric crystal 3: Micro control unit 4: resistor 5: Light-emitting diode 6: High voltage generating unit 61: Transformer 611: Primary winding 612: Secondary winding 62: capacitor 63: Transistor 64: voltage multiplier Cha: Charging control signal C1: The first control signal C2: second control signal D1: first drive signal D2: second drive signal Q1: The first end S1: Switch signal Vb: battery voltage Vi: DC input voltage Vo: DC output voltage Vs: voltage signal

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a circuit block diagram illustrating an embodiment of the power supply device of the present invention; Figure 2 is a circuit diagram illustrating an implementation aspect of a battery unit of the embodiment; Figure 3 is a circuit diagram illustrating another implementation aspect of the battery unit of the embodiment; Fig. 4 is a circuit diagram illustrating an implementation aspect of an anti-leakage unit of the embodiment; and FIG. 5 is a circuit diagram illustrating another implementation aspect of the leakage prevention unit of the embodiment.

100: Grid

1: battery unit

11: Transistor

12: Diode

13: battery

14: switch

2: Anti-leakage unit

21: The first transistor

22: second transistor

23: first resistor

24: second resistor

3: Micro control unit

4: resistor

5: Light-emitting diode

6: High voltage generating unit

61: Transformer

611: Primary winding

612: Secondary winding

62: capacitor

63: Transistor

64: voltage multiplier

Cha: Charging control signal

C1: The first control signal

C2: second control signal

D1: first drive signal

D2: second drive signal

Q1: The first end

S1: Switch signal

Vb: battery voltage

Vi: DC input voltage

Vo: DC output voltage

Vs: voltage signal

Claims (10)

A power supply device, including: A battery unit has a first terminal for receiving one of a DC input voltage and outputting a battery voltage, and also receives a charging control signal. The battery unit determines whether to use the DC voltage according to the charging control signal. Input voltage for charging; An anti-leakage unit electrically connected to the battery unit, receiving a first control signal instructing to read the battery voltage, and generating a voltage signal related to the current battery voltage of the battery unit according to the first control signal; and A micro-control unit, electrically connected to the battery unit and the anti-leakage unit, for receiving one of the DC input voltage and the battery voltage from the first terminal of the battery unit. The micro-control unit receives When the DC input voltage is reached, generate and output the first control signal to the anti-leakage unit and receive the voltage signal from the anti-leakage unit, and generate the charging control signal according to the voltage signal and a preset reference voltage, and The charging control signal is output to the battery unit. The power supply device according to claim 1, wherein the battery unit includes A transistor having a first end electrically connected to the first end of the battery unit, a second end, and a control end electrically connected to the micro control unit to receive the charging control signal, A diode having an anode electrically connected to the second end of the transistor, and a cathode, A battery electrically connected between the cathode of the diode and the ground, and provides the battery voltage, and A switch is electrically connected between the first end of the transistor and the cathode of the diode, and is controlled by a switching signal to be conductive or non-conductive. The power supply device according to claim 2, wherein the transistor is a bipolar transistor, and the battery unit further includes a resistor, the resistor having a first end that receives the charging control signal, and a battery Connect the second end of the control end of the transistor. The power supply device according to claim 1, wherein the battery unit includes A transistor having a first end electrically connected to the first end of the battery unit, a second end, and a control end, A resistor having a first end that receives the charging control signal, and a second end that is electrically connected to the control end of the transistor, A battery, electrically connected between the second end of the transistor and ground, and providing the battery voltage, and A switch is electrically connected between the first and second ends of the transistor, and is controlled by a switching signal to be conductive or non-conductive. The power supply device according to claim 1, wherein the leakage prevention unit includes A first transistor has a first terminal electrically connected to the battery cell, a second terminal providing the voltage signal, and a control terminal, A first resistor, electrically connected between the first terminal and the control terminal of the first transistor, A second transistor having a first terminal electrically connected to the control terminal of the first transistor, a second terminal grounded, and a control terminal electrically connected to the micro-control unit to receive the first control signal, and A second resistor is electrically connected between the second end of the second transistor and the control end. The power supply device according to claim 5, wherein each of the first and second transistors is a bipolar transistor, and the leakage prevention unit further includes a third resistor, the third resistor having an electrical A first terminal connected to the micro-control unit to receive the first control signal, and a second terminal electrically connected to the control terminal of the second transistor. The power supply device according to claim 1, wherein the leakage prevention unit includes A resistor having a first terminal electrically connected to the micro-control unit to receive the first control signal, and a second terminal, and A photoelectric coupler includes a light emitting diode electrically connected between the second end of the resistor and the ground, and a photoelectric device electrically connected between the battery unit and the micro-control unit and providing the voltage signal Crystal. The power supply device according to claim 1, further comprising: A resistor having a first end that is electrically connected to the micro-control unit, and a second end, and A light emitting diode having an anode electrically connected to the second end of the resistor, and a grounded cathode, When the micro-control unit receives the DC input voltage, the micro-control unit also generates a first driving signal according to the DC input voltage, the voltage signal, and the preset reference voltage and outputs it to the light emitting diode, so that the The light emitting diode blinks and emits light according to the first driving signal. The power supply device according to claim 8, wherein when the micro-control unit receives the battery voltage, the micro-control unit also generates a second driving signal according to the battery voltage and outputs it to the light-emitting diode, so that The light emitting diode continuously emits light according to the second driving signal. The power supply device according to claim 1, wherein the micro-control unit further generates a second control signal according to one of the DC input voltage and the battery voltage, and the power supply device further includes: A high-voltage generating unit is electrically connected to the first end of the battery unit and the micro-control unit to receive the battery voltage and the second control signal, respectively. When the high-voltage generating unit receives the battery voltage, it is based on the battery voltage and The second control signal generates a DC output voltage, and includes A transformer includes a primary winding and a secondary winding, each of the primary and secondary windings has a first end and a second end, and the first end of the primary winding is electrically connected to the battery unit The first terminal is to receive the battery voltage, when the first terminal of the primary winding receives the battery voltage, the transformer generates a high-voltage output voltage on the secondary winding according to the battery voltage, A capacitor electrically connected between the first end of the primary winding and ground, A transistor having a first end electrically connected to the second end of the primary winding, a grounded second end, and a control end electrically connected to the micro-control unit to receive the second control signal, and A voltage multiplier is electrically connected to the first and second ends of the secondary winding to receive the high-voltage output voltage, and generates the DC output voltage according to the high-voltage output voltage.

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