Portable safety charging circuit for toy vehicles

Abstract

The utility model discloses a portable safety charging circuit for toy car, include: input interface circuit, boost circuit and output interface circuit, input interface circuit is connected with boost circuit, boost circuit with output interface circuit is connected, input interface circuit is connected with 5V direct current voltage source, and 5V direct current voltage is input to boost circuit, and boost circuit is input to output interface circuit after 5V direct current voltage voltage -raising to demand voltage. The utility model discloses utilize 5V voltage of cell -phone charger as power supply, has solved the problem of high -voltage input, has reduced the security risk greatly, second low -voltage input low -voltage output, need not electrolytic capacitor and isolation transformer to improve the product reliability and reduce the cost, simultaneously, multi -gear output has improved the use portability greatly.

Description

Technical Field

[0001] This utility model relates to the field of charging circuit technology, and more specifically to a portable and safe charging circuit for toy cars. Background Technology

[0002] With the rapid development of the children's economy, a wide variety of electric toy cars for children have emerged. Among them, electric motorcycles, excavators, and three-wheeled and four-wheeled cars, which use lead-acid or lithium batteries as power batteries, are particularly popular with children. However, due to the diversity of battery specifications, the types of battery chargers are also very varied, and their quality is inconsistent.

[0003] Battery voltages are mainly 6V, 9V, 12V, and 21V. Current charger solutions involve rectifying the 220V AC power, then performing high-frequency chopping, and finally transferring the energy from the high-voltage side to the low-voltage side via a high-frequency isolation transformer. After further rectification, the energy is converted to 6V, 9V, 12V, or 21V DC power to charge the battery. The circuit diagram is shown below. Figure 1 As shown;

[0004] The current solution has three flaws:

[0005] I. Safety

[0006] 220V AC power is high voltage, far exceeding the national standard of 36V safety voltage, which can easily cause electric shock accidents; secondly, high-frequency isolation transformers generate a large amount of electromagnetic radiation, which is harmful to health.

[0007] II. Reliability

[0008] The existing solution requires an electrolytic capacitor filter circuit, but electrolytic capacitors have a limited lifespan; secondly, the high-frequency isolation transformer is a non-standard custom component with low reliability, and it often fails after only a few uses.

[0009] III. Portability

[0010] To accommodate batteries with different voltage levels, chargers need to be manufactured to various voltage specifications. However, users often encounter situations where the charger and battery are incompatible, preventing charging.

[0011] Therefore, how to provide a portable and safe charging circuit for toy cars is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0012] In view of this, this utility model provides a portable and safe charging circuit for toy cars, aiming to solve the safety hazards and electromagnetic radiation hazards caused by high voltage input; on the other hand, by adopting low voltage input, it can eliminate the need for easily damaged components such as electrolytic capacitors and isolation transformers, thereby reducing costs and improving product reliability; the wide range of multi-level output can be adapted to batteries of different specifications such as 6V, 9V, 12V, and 21V, solving the technical problem of portable charging.

[0013] To achieve the above objectives, the present invention adopts the following technical solution:

[0014] A portable and safe charging circuit for toy cars includes:

[0015] The circuit includes an input interface circuit, a boost circuit, and an output interface circuit, wherein the input interface circuit is connected to the boost circuit, and the boost circuit is connected to the output interface circuit.

[0016] The input interface circuit is connected to an external 5V DC voltage source and inputs the 5V DC voltage to the boost circuit. The boost circuit boosts the 5V DC voltage to the required voltage and then inputs it to the output interface circuit.

[0017] Furthermore, it is also equipped with a shift circuit and a gear position indicator circuit;

[0018] The input terminal of the shift circuit is connected to the boost circuit, and the output terminal is connected to the control terminal of the gear position indicator circuit.

[0019] The input terminal of the gear indicator circuit is connected to the boost circuit, and the output terminal is connected to the output interface circuit.

[0020] Furthermore, the interface circuit is a Type-C interface module, specifically...

[0021] The EH pin and two GND pins of U1 are grounded, the two VBUS pins are connected to the boost circuit, the CC1 pin is left empty, and the CC2 pin is left empty.

[0022] Furthermore, the boost circuit specifically comprises:

[0023] Pin 1 of chip U2 is connected to the positive terminal of diode D3. The negative terminal of diode D3 is connected to the output interface circuit through resistor R15. The negative terminal of diode D3 is connected to the shift circuit through resistors R16 and R20. The negative terminal of diode D3 is grounded through capacitor C8. Capacitor C8 is connected in parallel with capacitors C9, C10, and C11. Pin 2 is grounded. Pin 3 is grounded through capacitor C3. Pin 3 is connected to the shift circuit through resistor R20. Pin 4 is grounded through resistor R14 and capacitor C12. Pin 5 is connected to pin 1 through inductor L2. Pin 6 is left unconnected.

[0024] Furthermore, the shifting circuit specifically comprises:

[0025] The boost circuit is grounded through resistor R22 and connected to the collector of diode Q5. The emitter of diode Q5 is grounded. The non-inverting input of operational amplifier A is connected to the 5V power supply through resistor R23 and button S1. The non-inverting input of operational amplifier A is grounded through capacitor C16, which is connected in parallel with resistor R8. The inverting input of operational amplifier A is connected to the 5V power supply through resistor R27 and grounded through resistor R30. The inverting input of operational amplifier A is connected to the non-inverting input of operational amplifier B. The output of operational amplifier A is connected to the anode of diode D6. The cathode of diode D6 is connected to the non-inverting input of operational amplifier A and the cathode of diode D6 is connected to the inverting input of operational amplifier B. The output of operational amplifier A is connected to the base of transistor Q5 through resistor R7 and to the control terminal of the gear indicator circuit through resistor R24. The output of operational amplifier B is connected to another control terminal of the gear indicator circuit through resistor R29.

[0026] Furthermore, the gear position indicator circuit specifically comprises:

[0027] The boost circuit is connected to the collector of transistor Q3 through resistors R3 and R17. The emitter of transistor Q3 is grounded through resistor R26. LED HL3 is connected in parallel across the branch formed by resistor R17 and transistor Q3. The positive terminal of LED HL3 is connected to resistor R17, and the negative terminal is connected to the emitter of transistor Q3. The base of transistor Q3 is connected to the output of operational amplifier A through resistor R24.

[0028] The boost circuit is connected to the collector of transistor Q1 through resistors R4 and R18. The emitter of transistor Q1 is grounded through resistor R26. LED HL5 is connected in parallel across the branch formed by resistor R18 and transistor Q1. The positive terminal of LED HL5 is connected to resistor R18, and the negative terminal is connected to the emitter of transistor Q1. The base of transistor Q1 is connected to the output of operational amplifier B through resistor R29.

[0029] The boost circuit is connected to the emitter of transistor Q2. The collector of transistor Q2 is connected to the positive terminal of LED HL4 through resistor R5. The negative terminal of LED HL4 is grounded through resistor R26.

[0030] The boost circuit is connected to the base of transistor Q2 through resistors R15 and R19, and grounded through resistors R15, R19 and R25.

[0031] This utility model discloses a portable and safe charging circuit for toy cars. This utility model uses the 5V voltage of a mobile phone charger as a power supply, which solves the problem of high voltage input and greatly reduces safety hazards. Secondly, the low voltage input and low voltage output eliminates the need for electrolytic capacitors and isolation transformers, improving product reliability and reducing costs. At the same time, the multi-level output greatly improves portability. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a conventional toy car charging circuit according to the present invention.

[0034] Figure 2 This is a schematic diagram of the structure of a portable and safe charging circuit for toy cars according to the present invention.

[0035] Figure 3 This is a schematic diagram of the input interface circuit structure of this utility model.

[0036] Figure 4 This is a schematic diagram of the boost circuit structure of this utility model.

[0037] Figure 5 This is a schematic diagram of the shifting circuit structure of this utility model.

[0038] Figure 6 This is a schematic diagram of the gear indicator circuit structure of this utility model. Detailed Implementation

[0039] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] See appendix Figure 1-6 This utility model discloses a portable and safe charging circuit for toy cars, comprising:

[0041] The system includes an input interface circuit, a boost circuit, and an output interface circuit. The input interface circuit is connected to the boost circuit, and the boost circuit is connected to the output interface circuit. It also includes a shift circuit and a gear position indicator circuit. The input terminal of the shift circuit is connected to the boost circuit, and the output terminal is connected to the control terminal of the gear position indicator circuit. The input terminal of the gear position indicator circuit is connected to the boost circuit, and the output terminal is connected to the output interface circuit.

[0042] The boost circuit is as follows:

[0043] Pin 1 of chip U2 is connected to the anode of diode D3. The cathode of diode D3 is connected to the output interface circuit through resistor R15. The cathode of diode D3 is also connected to the shift circuit through resistors R16 and R20. The cathode of diode D3 is grounded through capacitor C8, which is connected in parallel with capacitors C9, C10, and C11. Pin 2 is grounded. Pin 3 is grounded through capacitor C3 and connected to the shift circuit through resistor R20. Pin 4 is grounded through resistor R14 and capacitor C12. Pin 5 is connected to pin 1 through inductor L2. Pin 6 is left unconnected. The model of chip U2 is TX4211.

[0044] The shift circuit is as follows:

[0045] The boost circuit is grounded through resistor R22 and connected to the collector of diode Q5. The emitter of diode Q5 is grounded. The non-inverting input of operational amplifier A is connected to the 5V power supply through resistor R23 and button S1. The non-inverting input of operational amplifier A is grounded through capacitor C16, which is connected in parallel with resistor R8. The inverting input of operational amplifier A is connected to the 5V power supply through resistor R27 and grounded through resistor R30. The inverting input of operational amplifier A is connected to the non-inverting input of operational amplifier B. The output of operational amplifier A is connected to the anode of diode D6. The cathode of diode D6 is connected to the non-inverting input of operational amplifier A and the cathode of diode D6 is connected to the inverting input of operational amplifier B. The output of operational amplifier A is connected to the base of transistor Q5 through resistor R7 and to the control terminal of the gear indicator circuit through resistor R24. The output of operational amplifier B is connected to another control terminal of the gear indicator circuit through resistor R29.

[0046] The gear position indicator circuit is as follows:

[0047] The boost circuit is connected to the collector of transistor Q3 through resistors R3 and R17. The emitter of transistor Q3 is grounded through resistor R26. LED HL3 is connected in parallel across the branch formed by resistor R17 and transistor Q3. The positive terminal of LED HL3 is connected to resistor R17, and the negative terminal is connected to the emitter of transistor Q3. The base of transistor Q3 is connected to the output of operational amplifier A through resistor R24.

[0048] The boost circuit is connected to the collector of transistor Q1 through resistors R4 and R18. The emitter of transistor Q1 is grounded through resistor R26. LED HL5 is connected in parallel across the branch formed by resistor R18 and transistor Q1. The positive terminal of LED HL5 is connected to resistor R18, and the negative terminal is connected to the emitter of transistor Q1. The base of transistor Q1 is connected to the output of operational amplifier B through resistor R29.

[0049] The boost circuit is connected to the emitter of transistor Q2. The collector of transistor Q2 is connected to the positive terminal of LED HL4 through resistor R5. The negative terminal of LED HL4 is grounded through resistor R26.

[0050] The boost circuit is connected to the base of transistor Q2 through resistors R15 and R19, and grounded through resistors R15, R19 and R25.

[0051] The input interface circuit is connected to an external 5V DC voltage source, and the 5V DC voltage is input to the boost circuit. The boost circuit boosts the 5V DC voltage to the required voltage and then inputs it to the output interface circuit.

[0052] The interface circuit is a Type-C interface module. Specifically, the EH pin and two GND pins of U1 are grounded, the two VBUS pins are connected to the boost circuit, the CC1 pin is left empty, and the CC2 pin is left empty.

[0053] The Type-C input interface connects to the 5V DC voltage output from the phone charger. U2 is a power management chip with a built-in MOSFET, which, together with inductor L2 and diode D3, forms a boost circuit.

[0054] In the initial state, the shift switch of the gear circuit is not pressed, the voltage at the non-inverting input of the operational amplifier U3A is 0, and the inverting cutoff voltage is 2.5V. Therefore, the output of the operational amplifier is low. At this time, the transistor Q5 is in the cutoff state. Resistors R20 and R22 are connected in series to form a low-side voltage divider resistor, which provides a 0.6V voltage feedback signal to the boost circuit, so that the boost circuit outputs a 7.5V voltage to charge the 6V battery.

[0055] When the button switch is pressed and held for 2-3 seconds, the voltage at the non-inverting input of op-amp U3A rises and eventually exceeds the voltage at the inverting input. At this time, the op-amp outputs a high level. This high level acts as positive feedback through diode D6, forming a self-locking circuit. Even if the button switch is released, op-amp U3A still outputs a high level. At this time, transistor Q5 is in a saturated conduction state, and resistor R22 is almost short-circuited, which reduces the resistance of the voltage divider resistor. When a 0.6V voltage feedback signal is still provided to the boost circuit, the boost circuit output rises to 13.5V, charging the 12V battery.

[0056] When the voltage is at the low setting of 7.5V, U3A outputs a low level, and similarly, U3B outputs a high level. Therefore, transistor Q3 is cut off, the green LED (HL3) lights up, and Q1 conducts, clamping the voltage across the blue LED (HL5) to 0.3V, so the blue LED does not light up. When the voltage is at the low setting of 13.5V, U3A outputs a high level, and similarly, U3B outputs a low level. Therefore, transistor Q1 is cut off, the blue LED lights up, and Q3 conducts, clamping the voltage across the green LED to 0.3V, so the green LED does not light up.

[0057] Whether it's the high or low setting, when the battery is connected to the power output terminal to start charging, a circuit will pass through resistors R12, R13, and R15, generating a voltage drop across these resistors. This causes transistor Q2 to conduct, so the red LED (light-emitting diode HL4) lights up, indicating that charging has started. When fully charged, the charging current will be very small, so the voltage drop across the resistors will also be very small. This is not enough to turn on transistor Q2, so the red LED will turn off, indicating that charging is complete.

[0058] It is worth noting that as long as the charger has power, whether it is fully charged or not, the green or blue LED will remain on. The difference is that the green light is always on when the power setting is low, and the blue light is always on when the power setting is high.

[0059] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable and safe charging circuit for toy cars, characterized in that, include: The circuit includes an input interface circuit, a boost circuit, and an output interface circuit, wherein the input interface circuit is connected to the boost circuit, and the boost circuit is connected to the output interface circuit. The input interface circuit is connected to an external 5V DC voltage source and inputs the 5V DC voltage to the boost circuit. The boost circuit boosts the 5V DC voltage to the required voltage and then inputs it to the output interface circuit.

2. The portable and safe charging circuit for toy cars according to claim 1, characterized in that, It is also equipped with a shift circuit and a gear position indicator circuit; The input terminal of the shift circuit is connected to the boost circuit, and the output terminal is connected to the control terminal of the gear position indicator circuit. The input terminal of the gear indicator circuit is connected to the boost circuit, and the output terminal is connected to the output interface circuit.

3. The portable and safe charging circuit for toy cars according to claim 1, characterized in that, The interface circuit is a Type-C interface module. Specifically... The EH pin and two GND pins of U1 are grounded, the two VBUS pins are connected to the boost circuit, the CC1 pin is left empty, and the CC2 pin is left empty.

4. The portable and safe charging circuit for toy cars according to claim 1, characterized in that, The boost circuit is specifically as follows: Pin 1 of chip U2 is connected to the positive terminal of diode D3. The negative terminal of diode D3 is connected to the output interface circuit through resistor R15. The negative terminal of diode D3 is connected to the shift circuit through resistors R16 and R20. The negative terminal of diode D3 is grounded through capacitor C8. Capacitor C8 is connected in parallel with capacitors C9, C10, and C11. Pin 2 is grounded. Pin 3 is grounded through capacitor C3. Pin 3 is connected to the shift circuit through resistor R20. Pin 4 is grounded through resistor R14 and capacitor C12. Pin 5 is connected to pin 1 through inductor L2. Pin 6 is left unconnected.

5. A portable and safe charging circuit for toy cars according to claim 2, characterized in that, The shifting circuit is specifically as follows: The boost circuit is grounded through resistor R22 and connected to the collector of diode Q5. The emitter of diode Q5 is grounded. The non-inverting input of operational amplifier A is connected to the 5V power supply through resistor R23 and button S1. The non-inverting input of operational amplifier A is grounded through capacitor C16, which is connected in parallel with resistor R8. The inverting input of operational amplifier A is connected to the 5V power supply through resistor R27 and grounded through resistor R30. The inverting input of operational amplifier A is connected to the non-inverting input of operational amplifier B. The output of operational amplifier A is connected to the anode of diode D6. The cathode of diode D6 is connected to the non-inverting input of operational amplifier A and the cathode of diode D6 is connected to the inverting input of operational amplifier B. The output of operational amplifier A is connected to the base of transistor Q5 through resistor R7 and to the control terminal of the gear indicator circuit through resistor R24. The output of operational amplifier B is connected to another control terminal of the gear indicator circuit through resistor R29.

6. A portable and safe charging circuit for toy cars according to claim 5, characterized in that, The gear position indicator circuit is specifically as follows: The boost circuit is connected to the collector of transistor Q3 through resistors R3 and R17. The emitter of transistor Q3 is grounded through resistor R26. LED HL3 is connected in parallel across the branch formed by resistor R17 and transistor Q3. The positive terminal of LED HL3 is connected to resistor R17, and the negative terminal is connected to the emitter of transistor Q3. The base of transistor Q3 is connected to the output of operational amplifier A through resistor R24. The boost circuit is connected to the collector of transistor Q1 through resistors R4 and R18. The emitter of transistor Q1 is grounded through resistor R26. LED HL5 is connected in parallel across the branch formed by resistor R18 and transistor Q1. The positive terminal of LED HL5 is connected to resistor R18, and the negative terminal is connected to the emitter of transistor Q1. The base of transistor Q1 is connected to the output of operational amplifier B through resistor R29. The boost circuit is connected to the emitter of transistor Q2. The collector of transistor Q2 is connected to the positive terminal of LED HL4 through resistor R5. The negative terminal of LED HL4 is grounded through resistor R26. The boost circuit is connected to the base of transistor Q2 through resistors R15 and R19, and grounded through resistors R15, R19 and R25.

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