Printer battery anti-reverse insertion circuit
By introducing anti-insert and anti-insert circuits into the printer battery anti-insert circuit, the circuit damage caused by battery reverse is solved, and the protection and voltage control of battery reverse is realized to ensure the safety of the printer circuit.
Patent Information
- Application Number
- CN202421745291.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-07-23
AI Technical Summary
Existing printers are prone to damage the circuit when the battery is inserted inverted, and continuing to charge after the battery is inserted inverted will cause damage to the chip, lacking an effective protection mechanism.
A battery anti-insert circuit including anti-insert circuit and anti-insert charge circuit is designed. The anti-insert circuit detects the state of the battery through components such as MOS tubes and resistors to prevent the circuit from being damaged; the anti-insert charge circuit controls the voltage through transistors and MOS tubes to prevent damage to the chip after the battery is inserted and inverted.
It effectively prevents the circuit from being damaged when the battery is inserted in the backward, and provides power-off protection after being inserted in the backward, prevents the voltage from exceeding the chip's withstand voltage and protects the printer circuit from damage.
Smart Images
Figure CN223124609U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery circuits, in particular to an anti-reverse insertion circuit for a printer battery. Background Art
[0002] With the continuous development and improvement of the printer industry, various types of printers such as home printers, commercial printers, and wrong-question printers are becoming more and more common. Printers provide convenience for everyone's life and have become an indispensable part of everyone's daily life.
[0003] At present, the printers seen on the market are powered by lithium batteries or by power supply. When using the battery, it needs to be installed in the battery compartment of the printer. However, during the process of inserting the battery, due to human negligence, the phenomenon of reverse insertion of the battery will inevitably occur. More seriously, if the battery is inserted reversely and not noticed in time, it is mistaken that the battery is out of power, and then the power supply is continued to be plugged in for charging, which will cause reverse charging of the printer circuit and damage, and finally the printer cannot be used. Summary of the Utility Model
[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to provide an anti-reverse insertion circuit for a printer battery, which can effectively prevent damage to the circuit after the battery is inserted reversely and protect against continued charging after reverse insertion, and provide power-off protection; it can effectively improve the safety performance of the printer.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] An anti-reverse insertion circuit for a printer battery provided by the utility model includes a power input unit and a charging circuit, and is characterized in that: an anti-reverse insertion circuit and an anti-reverse charging circuit are further arranged between the power input unit and the charging circuit, and the power input unit includes a lithium battery to provide a voltage suitable for operation for the printer.
[0007] The preferred technical solution of the utility model is that the anti-reverse insertion circuit includes a resistor R32, a resistor R33, a MOS transistor Q6, a MOS transistor Q5, a capacitor C45, and a contact J2; the first end of the resistor R32 is grounded, the gates of the MOS transistor Q6 and the MOS transistor Q5 are connected to the second end of the resistor R32, the contact J2 accesses the power supply BAT+ and is connected to the drains of the MOS transistor Q6 and the MOS transistor Q5, the sources of the MOS transistor Q6 and the MOS transistor Q5 are connected to the first end of the capacitor C45, the second end of the capacitor C45 is connected to the first end of the resistor R33, and the second end of the resistor R33 is connected to the drains of the MOS transistor Q6 and the MOS transistor Q5 and then jointly outputs to the anti-reverse charging circuit.
[0008] Preferably, the technical solution of the present utility model is that the anti-reverse charging circuit includes a resistor R37, a resistor R38, a triode Q8, and a MOS transistor Q7; the first end of the resistor R37 is connected to the second end of the resistor R33, the second end of the resistor R37 is connected to the base of the triode Q8, the collector of the triode Q8 is connected to the first end of the resistor R38, the emitter of the triode Q8 is grounded, the second end of the resistor R38 is connected to the source of the MOS transistor Q7, the gate of the MOS transistor Q7 is connected to the first end of the resistor R38, and the drain of the MOS transistor Q7 outputs to the charging circuit.
[0009] Preferably, the technical solution of the present utility model is that the charging circuit includes a capacitor C35, a capacitor C30, a capacitor C31, a capacitor C34, a capacitor C36, a capacitor C32, a capacitor C33, a chip U6, and a resistor R17; the first ends of the capacitor C35, the capacitor C30, the capacitor C31, and the capacitor C34 are commonly connected to the drain of the MOS transistor Q7, the second ends of the capacitor C35, the capacitor C30, the capacitor C31, and the capacitor C34 are all grounded, the VIN pin of the chip U6 is connected to the drain of the MOS transistor Q7, the two GND pins of the chip U6 are grounded, the first ends of the capacitor C36, the capacitor C32, and the capacitor C33 are all connected to the BAT pin of the chip U6 and the first end of the capacitor C36 is connected to the first end of the capacitor C45, the second ends of the capacitor C36, the capacitor C32, and the capacitor C33 are all grounded, the first end of the resistor R17 is connected to the PROG pin of the chip U6, and the second end of the resistor R17 is grounded.
[0010] The beneficial effects of the present utility model are as follows: In this case, an anti-reverse insertion circuit and an anti-reverse charging circuit are both provided. The anti-reverse insertion circuit is used to prevent damage to the circuit caused by reverse insertion of the battery, while the anti-reverse charging circuit is used to protect against continued charging after reverse insertion and perform power-off protection, preventing the voltage supplied to the chip from exceeding the withstand voltage of the chip after the battery is inserted reversely and causing damage to the chip. In this way, the entire circuit of the printer can be comprehensively protected; during operation, when the printer is connected to the battery, through the anti-reverse insertion circuit, when the battery is inserted reversely, the reverse insertion circuit is an open circuit, providing power-off protection against continued charging after reverse insertion; only when the battery is inserted correctly, the anti-reverse insertion circuit is a closed circuit, and the battery can effectively supply power to the printer. Then, through the anti-reverse charging circuit, the voltage supplied to the chip is controlled not to exceed the withstand voltage of the chip, providing protection against continued charging after reverse insertion. Description of the Drawings
[0011] Figure 1 It is a schematic diagram of the principle of an anti-reverse insertion circuit for a printer battery provided in the specific embodiment of the present utility model;
[0012] Figure 2It is a schematic diagram of the module structure of an anti-reverse insertion circuit for a printer battery provided in the specific implementation manner of the present utility model; Specific implementation manner
[0013] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific implementation manners.
[0014] As shown in the figure, an anti-reverse insertion circuit for a printer battery includes a power input unit and a charging circuit. An anti-reverse insertion circuit and an anti-back charging circuit are also provided between the power input unit and the charging circuit. Among them, the power input unit is used to supply power to the printer and charge the battery. Further, the power input unit includes a lithium battery to provide a voltage that meets the working requirements for the printer. The charging circuit charges the lithium battery and supplies power to the system. The anti-reverse insertion circuit is used to prevent damage to the circuit after the lithium battery is inserted reversely. The anti-back charging circuit can be used to protect against continued charging after the lithium battery is inserted reversely, provide power-off protection, and also prevent the voltage supplied to the chip from exceeding the withstand voltage of the chip and causing chip damage when the battery is inserted reversely.
[0015] Preferably, the anti-reverse insertion circuit includes resistor R32, resistor R33, MOS transistor Q6, MOS transistor Q5, capacitor C45, and contact J2. The first end of resistor R32 is grounded. The gates of MOS transistor Q6 and MOS transistor Q5 are connected to the second end of resistor R32. Contact J2 is connected to power supply BAT+ and connected to the drains of MOS transistor Q6 and MOS transistor Q5. The sources of MOS transistor Q6 and MOS transistor Q5 are connected to the first end of capacitor C45. The second end of capacitor C45 is connected to the first end of resistor R33. The second end of resistor R33 is connected to the drains of MOS transistor Q6 and MOS transistor Q5 and then jointly outputs to the anti-back charging circuit. Thus, when the lithium battery is not connected, the input remains at a low level. When the lithium battery supplies power to the printer, it is divided into the following two states:
[0016] (1) When the lithium battery is correctly connected, it becomes a high level. At this time, the voltage of the gates (G) of MOS transistor Q6 and MOS transistor Q5 is greater than the sources (S), and UG is 3V - 5V greater than US. The parasitic diode between them is in a conducting state, and the power supply of the lithium battery can be normally input into the circuit to supply power to the printer;
[0017] (2) When the lithium battery is inserted reversely, the voltage of the gates (G) of MOS transistor Q6 and MOS transistor Q5 is equal to the sources (S). The parasitic diode between them is in a cut-off state, and the power supply circuit is disconnected, so that the lithium battery cannot supply power, preventing damage to the circuit after the lithium battery is inserted reversely. The parallel connection of MOS transistor Q6 and MOS transistor Q5 in the anti-reverse insertion circuit can effectively protect the device from being damaged easily when the current is too large.
[0018] Preferably, the anti-reverse charging circuit is used to protect against continued charging when the lithium battery is inserted in reverse and for power-off protection. The anti-reverse charging circuit includes resistor R37, resistor R38, triode Q8, and MOS transistor Q7. The first end of resistor R37 is connected to the second end of resistor R33. The second end of resistor R37 is connected to the base of triode Q8. The collector of triode Q8 is connected to the first end of resistor R38. The emitter of triode Q8 is grounded. The second end of resistor R38 is connected to the source of MOS transistor Q7. The gate of MOS transistor Q7 is connected to the first end of resistor R38. The drain of MOS transistor Q7 outputs to the charging circuit. First, it is stated that the emitter voltage of triode Q8 is Ue, the base voltage is Ub, and the collector voltage is Uc. After the current passes through triode Q8, if the lithium battery is inserted in reverse, the emitter voltage Ue of triode Q8 is at a high level, that is, Ue > Ub. At this time, the triode is in a cut-off state. The voltage of the gate (G) of MOS transistor Q7 is equal to the source (S), and the parasitic diode between them is in a cut-off state. MOS transistor Q7 is in a cut-off state, which can effectively prevent current from entering the subsequent circuit. When the lithium battery is inserted in reverse and continues to be charged, it will cause the voltage supplied to chip U6 to exceed the withstand voltage of chip U6 and cause damage. However, this circuit can disconnect the battery from the subsequent charging circuit when the lithium battery is inserted in reverse to protect the chip of the charging circuit from being burned out. At the same time, triode Q8, as a small-current device, can ensure the stability of the circuit when Uc < Ub and Ue < Ub and it is in the saturation region. MOS transistor Q7, as a large-current device, can be in a cut-off state to protect the circuit when the printer passes through a large current and the lithium battery is connected in reverse and charged.
[0019] Finally, the charging circuit includes capacitor C35, capacitor C30, capacitor C31, capacitor C34, capacitor C36, capacitor C32, capacitor C33, chip U6, and resistor R17. The first ends of capacitor C35, capacitor C30, capacitor C31, and capacitor C34 are commonly connected to the drain of MOS transistor Q7. The second ends of capacitor C35, capacitor C30, capacitor C31, and capacitor C34 are all grounded. The VIN pin of chip U6 is connected to the drain of MOS transistor Q7. The two GND pins of chip U6 are grounded. The first ends of capacitor C36, capacitor C32, and capacitor C33 are all connected to the BAT pin of chip U6 and the first end of capacitor C36 is connected to the first end of capacitor C45. The second ends of capacitor C36, capacitor C32, and capacitor C33 are all grounded. The first end of resistor R17 is connected to the PROG pin of chip U6. The second end of resistor R17 is grounded. In this way, when the lithium battery is inserted correctly, the charging circuit can be normally turned on for charging and transmit power to the VBAT pin of the anti-reverse insertion circuit and supply power to the system simultaneously from the BAT pin.
[0020] The present utility model is described by way of preferred embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present utility model. The present utility model is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application all belong to the scope of protection of the present utility model.
Claims
1. A printer battery anti-reverse insertion circuit, comprising a power input unit and a charging circuit, characterized in that: An anti-reverse insertion circuit and an anti-backflow charging circuit are also provided between the power input unit and the charging circuit; The anti-reverse insertion circuit includes a resistor R32, a resistor R33, an MOS transistor Q6, an MOS transistor Q5, a capacitor C45, and a contact J2; the first end of the resistor R32 is grounded, the gates of the MOS transistor Q6 and the MOS transistor Q5 are connected to the second end of the resistor R32, the contact J2 accesses the power supply BAT+ and is connected to the drains of the MOS transistor Q6 and the MOS transistor Q5, the sources of the MOS transistor Q6 and the MOS transistor Q5 are connected to the first end of the capacitor C45, the second end of the capacitor C45 is connected to the first end of the resistor R33, and the second end of the resistor R33 is connected to the drains of the MOS transistor Q6 and the MOS transistor Q5 and then jointly outputs to the anti-backflow charging circuit.
2. An anti-reverse insertion circuit for a printer battery according to claim 1, wherein: The power input unit includes a lithium battery to provide a voltage suitable for the operation of the printer.
3. An anti-reverse insertion circuit for a printer battery according to claim 2, wherein: The anti-backflow charging circuit includes a resistor R37, a resistor R38, a triode Q8, and an MOS transistor Q7; the first end of the resistor R37 is connected to the second end of the resistor R33, the second end of the resistor R37 is connected to the base of the triode Q8, the collector of the triode Q8 is connected to the first end of the resistor R38, the emitter of the triode Q8 is grounded, the second end of the resistor R38 is connected to the source of the MOS transistor Q7, the gate of the MOS transistor Q7 is connected to the first end of the resistor R38, and the drain of the MOS transistor Q7 outputs to the charging circuit.
4. An anti-reverse insertion circuit for a printer battery according to claim 3, wherein: The charging circuit includes a capacitor C35, a capacitor C30, a capacitor C31, a capacitor C34, a capacitor C36, a capacitor C32, a capacitor C33, a chip U6, and a resistor R17; the first ends of the capacitor C35, the capacitor C30, the capacitor C31, and the capacitor C34 are jointly connected to the drain of the MOS transistor Q7, the second ends of the capacitor C35, the capacitor C30, the capacitor C31, and the capacitor C34 are all grounded, the VIN pin of the chip U6 is connected to the drain of the MOS transistor Q7, two GND pins of the chip U6 are grounded, the first ends of the capacitor C36, the capacitor C32, and the capacitor C33 are all connected to the BAT pin of the chip U6 and the first end of the capacitor C36 is connected to the first end of the capacitor C45, the second ends of the capacitor C36, the capacitor C32, and the capacitor C33 are all grounded, the first end of the resistor R17 is connected to the PROG pin of the chip U6, and the second end of the resistor R17 is grounded.