High-voltage pack driving circuit

Abstract

The utility model discloses a high-voltage pack driving circuit, comprising an MCU control circuit which comprises an MCU body, and the twelfth enable pin of the MCU body is electrically connected with two series batteries BAT; the charging circuit comprises a charging management chip, an MOS tube Q1, an inductor L1, a diode D2 and a resistor R10, and a second enabling pin and a seventh enabling pin of the charging management chip are electrically connected with a charging port; and the LDO step-down circuit comprises a second enable pin of an LDO chip which is electrically connected with a resistor R2 and a diode D1, and a third enable pin of the LDO chip is electrically connected with the first enable pin of the MCU body. According to the utility model, by designing the charging circuit and the LDO step-down circuit, the charging management of the two series batteries and the step-down stable power supply of the MCU half body can be realized, and the driving scheme can drive the long high-voltage pack of a high-voltage line more than 10cm without heating the whole circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to arc lighter technical field, more specifically, relate to a high voltage package drive circuit. BACKGROUND

[0002] The prior application CN221375738U of the applicant discloses a large capacity low voltage drive arc lighter, including LD0 voltage increasing circuit, LD0 voltage increasing circuit includes LD0 chip, and the first enable foot of LD0 chip is connected with R1 resistance, and the MCU control circuit of control LD0 voltage increasing circuit, including MCU body, and the second enable foot of MCU body is connected with battery and LD0 chip, and the side of battery is connected with D2 diode, and the MCU control circuit is connected with ignition switch, and the MCU control circuit is connected with high voltage package drive circuit.

[0003] However, the above prior art and the current market high voltage package drive scheme can only drive high voltage package with high voltage line length below 10CM, and cannot drive high voltage package with high voltage line length above 10CM, and cannot ignite or ignite for a short distance. Because with the growth of high voltage package line, the impedance will be larger and larger. The driving principle of high voltage package is to drive under high frequency pulse state, and the frequency is about 18KHZ to 20KHZ, and when the impedance is large, it forms a large voltage drop. And the voltage drop is below 3V, and the high voltage package cannot work normally.

[0004] And if the driving current of the circuit is increased, the whole circuit will heat up, and the requirement for the battery will be higher. Therefore, a new high voltage package drive scheme needs to be constructed, which can support the driving of high voltage package with high voltage line length above 10CM, and will not make the whole circuit heat up. SUMMARY

[0005] The utility model overcomes the insufficient of prior art, through design charging circuit and LDO voltage reducing circuit, can make to double section series connection battery's charge management and to MCU half body's voltage reduction stable power supply, this drive scheme can reach to 10CM above high voltage line length high voltage package's drive, and will not make the whole circuit heat up.

[0006] In order to achieve the above object, the utility model provides the following technical scheme:

[0007] A high voltage package drive circuit, comprising:

[0008] MCU control circuit, which includes MCU body, and the twelfth enable foot of MCU body is electrically connected with two section series connection battery BAT;

[0009] The charging circuit comprises a charging management chip, a MOS tube Q1, an inductor L1, a diode D2, a resistor R10, a second enabling pin and a seventh enabling pin of the charging management chip, and the second enabling pin and the seventh enabling pin are electrically connected with a charging port;

[0010] The LDO voltage reduction circuit comprises a second enabling pin of an LDO chip, a resistor R2 and a diode D1, and a third enabling pin of the LDO chip is electrically connected with a first enabling pin of the MCU body.

[0011] Preferably, the third enabling pin of the charging management chip is electrically connected with an electric quantity detection circuit, the electric quantity detection circuit comprises a resistor R6 and a resistor R9 connected in series, the resistor R9 is connected in parallel with a capacitor C5, one end of the capacitor C5 is grounded, and the other end is electrically connected with two series-connected batteries BAT.

[0012] Preferably, the charging port is electrically connected with a resistor R5 and a resistor R8 connected in series.

[0013] Preferably, the fifth enabling pin of the MCU body is electrically connected with a PWM circuit, and the PWM circuit comprises a MOS tube Q2, a resistor R12 and a resistor R13.

[0014] Preferably, the fourth enabling pin of the MCU is electrically connected with a first switch SW1, the third enabling pin of the MCU is electrically connected with a second switch SW2, and the sixth enabling pin of the MCU is electrically connected with an indicator lamp LED.

[0015] Preferably, the MCU is electrically connected with a digital tube P1.

[0016] The utility model discloses the beneficial effect:

[0017] The utility model discloses a charging circuit and LDO voltage reduction circuit can make to the charging management of double series connection battery, and to the voltage reduction stable power supply of MCU half body, and this drive scheme can reach the drive of 10CM above high voltage line long high voltage bag, and whole circuit will not make heat. DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the schematic diagram of MCU control circuit for the embodiment of the utility model;

[0019] Figure 2 It is the schematic diagram of charging circuit for the embodiment of the utility model;

[0020] Figure 3 It is the schematic diagram of LDO voltage reduction circuit for the embodiment of the utility model;

[0021] Figure 4 It is the schematic diagram of electric quantity detection circuit for the embodiment of the utility model;

[0022] Figure 5The utility model discloses a schematic diagram of the charging detection circuit for the embodiment of the utility model.

[0023] Figure 6 The utility model discloses a schematic diagram of the PWM circuit for the embodiment of the utility model.

[0024] Figure 7 The utility model discloses a schematic diagram of the switch display circuit for the embodiment of the utility model.

[0025] Figure 8 The utility model discloses a schematic diagram of the nixie tube circuit for the embodiment of the utility model. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be apparently and completely described in conjunction with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work fall within the protection scope of the utility model.

[0027] As shown in Figures 1-8 A high-voltage package driving circuit, comprising: an MCU control circuit, comprising an MCU body, a twelfth enable foot of the MCU body is electrically connected with two series batteries BAT; a charging circuit, comprising a charging management chip, a MOS tube Q1, an inductor L1, a diode D2 and a resistor R10, a second enable foot and a seventh enable foot of the charging management chip are electrically connected with a charging port; an LDO voltage reduction circuit, comprising a second enable foot of an LDO chip electrically connected with a resistor R2 and a diode D1, a third enable foot of the LDO chip is electrically connected with a first enable foot of the MCU body; a third enable foot of the charging management chip is electrically connected with a power detection circuit, the power detection circuit comprises a resistor R6 and a resistor R9 connected in series, a capacitor C5 is connected in parallel on the resistor R9, one end of the capacitor C5 is grounded, and the other end is electrically connected with the two series batteries BAT; the charging port is electrically connected with a resistor R5 and a resistor R8 connected in series; a fifth enable foot of the MCU body is electrically connected with a PWM circuit, the PWM circuit comprises a MOS tube Q2, a resistor R12 and a resistor R13; a fourth enable foot of the MCU is electrically connected with a first switch SW1, a third enable foot of the MCU is electrically connected with a second switch SW2, and a sixth enable foot of the MCU is electrically connected with an indicator lamp LED; the MCU is electrically connected with a nixie tube P1.

[0028] By adopting the technical scheme, in the utility model, through the use of two batteries in series, the working current is about 2A, and the working voltage is between 6V and 8.4V. Specifically, the charging management chip can be charged by CN3302. CN3302 is a PFM boost type double lithium battery charging control integrated circuit working at 2.75V to 6.5V. CN3302 uses constant current and quasi-constant voltage mode (Quasi-CVTM) to charge the battery, and is internally integrated with a reference voltage source, an inductance current detection unit, a battery voltage detection circuit and an external field effect transistor drive circuit, and has the advantages of few external components, simple circuit and the like. When the input power is turned on, CN3302 enters the charging state, controls the external N-channel MOSFET to be turned on, the inductance current rises, when the inductance current rises to the upper limit set by the external current detection resistor, the external N-channel MOSFET is turned off, the inductance current drops, and the energy in the inductor is transferred to the battery. When the inductance current drops to the lower limit set by the external current detection resistor, the external N-channel MOSFET is turned on again, and the cycle is repeated. When the voltage of the BAT pin reaches the internal setting of 8.4V (8.4V is taken as a typical value) for the first time, CN3302 enters the quasi-constant voltage charging mode, and charges the battery with a small current. In the quasi-constant voltage mode, when the voltage of the BAT pin reaches 8.4V, the charging process is completed, and the external N-channel MOSFET remains in the off state. When the voltage of the BAT pin drops to the recharge threshold, CN3302 enters the charging state again. The highest working frequency of CN3302 can reach 1MHz. When the battery voltage is lower than the input voltage or the battery is short-circuited, CN3302 continues to charge the battery with a small current under the joint action of the external N-channel MOSFET and the P-channel MOSFET, thereby protecting the battery. Other functions include chip enable input, die over-temperature protection and status indication output, and the like.

[0029] And the MCU is powered by LDO voltage reduction, and a high-frequency driving pulse is output through the fifth pin. The P1 digital tube provides power display and ignition frequency display.

[0030] In this way, by designing the charging circuit and the LDO voltage reduction circuit, the charging management of the double-battery series battery and the stable power supply of the MCU half body can be realized, and the driving scheme can drive the high-voltage package of the high-voltage line with a length of more than 10CM without heating the whole circuit.

[0031] The above merely describes a preferred specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A high voltage pack drive circuit, characterized by, Comprise: MCU control circuit, including the MCU body, the twelfth enable foot of the MCU body is electrically connected with two series batteries BAT; Charging circuit, including charging management chip, MOS tube Q1, inductor L1, diode D2, resistor R10, the second enable foot and the seventh enable foot of the charging management chip are electrically connected with the charging port; LDO voltage reduction circuit, including the second enable foot of LDO chip is electrically connected with resistor R2 and diode D1, the third enable foot of LDO chip is electrically connected with the first enable foot of MCU body.

2. A high voltage pack drive circuit according to claim 1, characterized in that The third enable foot of the charging management chip is electrically connected with the electric quantity detection circuit, and the electric quantity detection circuit comprises series-connected resistor R6 and resistor R9, capacitor C5 is connected in parallel on resistor R9, one end of capacitor C5 is grounded, and the other end is electrically connected with two series batteries BAT.

3. The high voltage pack drive circuit of claim 1, wherein, The charging port is electrically connected with resistor R5 and series-connected resistor R8.

4. The high voltage pack drive circuit of claim 1, wherein, The fifth enable foot of the MCU body is electrically connected with PWM circuit, and the PWM circuit comprises MOS tube Q2, resistor R12 and resistor R13.

5. The high voltage pack drive circuit of claim 1, wherein, The fourth enable foot of the MCU is electrically connected with the first switch SW1, the third enable foot of the MCU is electrically connected with the second switch SW2, and the sixth enable foot of the MCU is electrically connected with the indicator lamp LED.

6. The high voltage pack drive circuit of claim 1, wherein, The MCU is electrically connected with the nixie tube P1.

Images