Printer power-on circuit

Abstract

The utility model provides a printer power supply starting circuit, include: switch signal circuit, be used for the transmission printer press power switch button's press command to main control chip, drive circuit, be used for driving first triode conduction, and control first MOS pipe closes, power switch button, be used for controlling printer power supply starting circuit's conduction or disconnect, main power switch circuit, be used for controlling main power's opening or closing, self locking circuit, be used for controlling first MOS pipe keeps closing, closing signal circuit, be used for controlling main power closes, low voltage power switch circuit, be used for forming low voltage power supply. The utility model discloses through the mutual cooperation between switch signal circuit, drive circuit, power switch button, main power switch circuit, self locking circuit, closing signal circuit and low voltage power switch circuit in printer power supply starting circuit, has reduced the cost of ordinary power supply starting circuit, has improved the flexibility of power supply starting characteristic.

Description

Technical Field

[0001] This utility model relates to the field of printer power start-up circuit technology, and in particular to a printer power start-up circuit. Background Technology

[0002] Regular inkjet printers use ink cartridges for printing. The printer contains a power starter. This printer is a small electrical appliance, and ordinary power starter integrated circuits are expensive and have inherent starting characteristics. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of existing printer power start-up integrated circuits, such as high cost and inherent start-up characteristics, and to provide a printer power start-up circuit.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] This utility model provides a printer power start circuit, including a switch signal circuit, a drive circuit, a power switch button, a main power switch circuit, a self-locking circuit, a shutdown signal circuit, and a low-voltage power switch circuit. The switch signal circuit, the drive circuit, the power switch button, the main power switch circuit, the self-locking circuit, and the shutdown signal circuit are electrically connected to the low-voltage power switch circuit.

[0006] The switch signal circuit is used to transmit the press command of the printer power switch button to the main control chip;

[0007] The driving circuit is used to drive the first transistor to conduct and control the first MOSFET to turn off;

[0008] The power switch button is used to control the on or off of the printer's power-on circuit.

[0009] The main power switch circuit is used to control the main power supply to be turned on or off.

[0010] The self-locking circuit is used to control the first MOSFET to remain off;

[0011] The shutdown signal circuit is used to control the main power supply to shut down;

[0012] The low-voltage power supply switching circuit is used to generate a low-voltage power supply.

[0013] Preferably, the switching signal circuit includes a first pull-up resistor and a first transistor;

[0014] One end of the first pull-up resistor is electrically connected to the low-voltage power supply, the other end of the first pull-up resistor is electrically connected to the collector of the first transistor, the emitter of the first transistor is grounded, and the base of the first transistor is electrically connected to the driving circuit.

[0015] Preferably, the driving circuit includes a second pull-up resistor, a first pull-down resistor, and a first current-limiting resistor;

[0016] One end of the first current-limiting resistor is electrically connected to the base of the first transistor, and the other end of the first current-limiting resistor is electrically connected to one end of the second pull-up resistor, one end of the first pull-down resistor, and one end of the power switch button. The other end of the second pull-up resistor is electrically connected to the low-voltage power supply, and the other end of the first pull-down resistor is grounded.

[0017] Preferably, the main power switch circuit includes a first MOSFET, a first voltage divider resistor, and a second voltage divider resistor;

[0018] One end of the first voltage divider resistor is electrically connected to one end of the second voltage divider resistor, the other end of the power switch button, and the gate of the first MOS transistor. The other end of the first voltage divider resistor is electrically connected to an external power supply. The other end of the second voltage divider resistor is grounded. The drain of the first MOS transistor is electrically connected to the main power supply. The source of the first MOS transistor is grounded.

[0019] Preferably, the self-locking circuit includes a second MOS transistor and a second current-limiting resistor;

[0020] The drain of the second MOS transistor is electrically connected to the other end of the power switch button, the gate of the second MOS transistor is electrically connected to one end of the second current-limiting resistor, the source of the second MOS transistor is grounded, and the other end of the second current-limiting resistor is electrically connected to the low-voltage power supply.

[0021] Preferably, the shutdown signal circuit includes a third MOSFET, a second pull-down resistor, a third current-limiting resistor, and a capacitor;

[0022] The drain of the third MOS transistor is electrically connected to one end of the second current-limiting resistor and the gate of the second MOS transistor, respectively. The gate of the third MOS transistor is electrically connected to one end of the second pull-down resistor, one end of the second pull-down resistor is electrically connected to one end of the capacitor, one end of the capacitor is electrically connected to one end of the third current-limiting resistor, and the other end of the second pull-down resistor, the other end of the capacitor, and the source of the third MOS transistor are all grounded.

[0023] Preferably, the low-voltage power supply switching circuit includes a fourth MOSFET, a fourth current-limiting resistor, and a third pull-up resistor;

[0024] The gate of the fourth MOS transistor is electrically connected to one end of the fourth current-limiting resistor, the other end of the fourth current-limiting resistor is electrically connected to the main power switch circuit, the drain of the fourth MOS transistor is electrically connected to one end of the third pull-up resistor, the other end of the third pull-up resistor is electrically connected to the main power supply, and the source of the fourth MOS transistor is grounded.

[0025] Preferably, the first transistor is a PNP transistor and the first MOS transistor is an NMOS transistor.

[0026] Preferably, both the second MOS transistor and the third MOS transistor are NMOS transistors.

[0027] Preferably, the fourth MOS transistor is an NMOS transistor.

[0028] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0029] The positive and progressive effects of this utility model are as follows:

[0030] This invention reduces the cost of ordinary power-starting circuits and improves the flexibility of power-starting characteristics by coordinating the switching signal circuit, drive circuit, power switch button, main power switch circuit, self-locking circuit, shutdown signal circuit and low-voltage power switch circuit in the printer power-starting circuit. Attached Figure Description

[0031] Figure 1 This is a circuit diagram of the printer power-on circuit of Embodiment 1 of this utility model. Detailed Implementation

[0032] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0033] Example 1

[0034] This embodiment provides a printer power-on circuit, such as... Figure 1 As shown, it includes a switch signal circuit, a drive circuit, a power switch button S1, a main power switch circuit, a self-locking circuit, a shutdown signal circuit, and a low-voltage power switch circuit. The switch signal circuit, drive circuit, power switch button S1, main power switch circuit, self-locking circuit, shutdown signal circuit, and low-voltage power switch circuit are electrically connected.

[0035] The switch signal circuit is used to transmit the power switch button press command to the main control chip.

[0036] A driving circuit is used to drive the first transistor to conduct and control the first MOSFET to turn off;

[0037] The power switch button S1 is used to control the on or off of the printer's power-on circuit.

[0038] The main power switch circuit is used to control the main power supply to be turned on or off.

[0039] A self-locking circuit is used to control the first MOSFET to remain off.

[0040] The shutdown signal circuit is used to control the main power supply to shut down;

[0041] Low-voltage power supply switching circuit, used to generate a low-voltage power supply.

[0042] In an alternative embodiment, such as Figure 1 As shown, the switching signal circuit includes a first pull-up resistor R1 and a first transistor Q1;

[0043] One end of the first pull-up resistor R1 is electrically connected to a low-voltage power supply (e.g., 3.3V), the other end of the first pull-up resistor R1 is electrically connected to the collector of the first transistor Q1, the emitter of the first transistor Q1 is grounded, and the base of the first transistor Q1 is electrically connected to the drive circuit.

[0044] In this embodiment, the first transistor is a PNP transistor and the first MOS transistor is an NMOS transistor.

[0045] In this embodiment, a high-level signal is generated when the first transistor Q1 is not turned on, and a low-level signal is generated when it is turned on.

[0046] In addition, the first pull-up resistor R1 has a resistance of 10 KΩ.

[0047] In an alternative embodiment, such as Figure 1 As shown, the driving circuit includes a second pull-up resistor R2, a first pull-down resistor R3, and a first current-limiting resistor R4;

[0048] One end of the first current-limiting resistor R4 is electrically connected to the base of the first transistor Q1. The other end of the first current-limiting resistor R4 is electrically connected to one end of the second pull-up resistor R2, one end of the first pull-down resistor R3, and one end of the power switch button S1. The other end of the second pull-up resistor R2 is electrically connected to a low-voltage power supply (e.g., 3.3V), and the other end of the first pull-down resistor R3 is grounded.

[0049] In this embodiment, the resistance value of the second pull-up resistor R2 is 1KΩ, the resistance value of the first pull-down resistor R3 is 2KΩ, and the resistance value of the first current-limiting resistor R4 is 15.4KΩ.

[0050] In an alternative embodiment, such as Figure 1 As shown, the main power switch circuit includes a first MOSFET Q2, a first voltage divider resistor R5, and a second voltage divider resistor R6.

[0051] One end of the first voltage divider resistor R5 is electrically connected to one end of the second voltage divider resistor R6, the other end of the power switch button S1, and the gate of the first MOSFET Q2. The other end of the first voltage divider resistor R5 is electrically connected to an external power supply (e.g., 24V). The other end of the second voltage divider resistor R6 is grounded. The drain of the first MOSFET Q2 is electrically connected to the main power supply (e.g., 5V), and the source of the first MOSFET Q2 is grounded.

[0052] In this embodiment, the resistance value of the first voltage divider resistor R5 is 100KΩ and the resistance value of the second voltage divider resistor R6 is 15.4KΩ.

[0053] In an alternative embodiment, such as Figure 1 As shown, the self-locking circuit includes a second MOSFET Q3 and a second current-limiting resistor R7.

[0054] The drain of the second MOSFET Q3 is electrically connected to the other end of the power switch button S1, the gate of the second MOSFET Q3 is electrically connected to one end of the second current limiting resistor R7, the source of the second MOSFET Q3 is grounded, and the other end of the second current limiting resistor R7 is electrically connected to the low voltage power supply.

[0055] In this embodiment, the resistance value of the second current-limiting resistor R7 is 10KΩ.

[0056] In an alternative embodiment, such as Figure 1 As shown, the shutdown signal circuit includes a third MOSFET Q4, a second pull-down resistor R8, a third current-limiting resistor R9, and a capacitor C;

[0057] The drain of the third MOSFET Q4 is electrically connected to one end of the second current-limiting resistor R7 and the gate of the second MOSFET Q3. The gate of the third MOSFET Q4 is electrically connected to one end of the second pull-down resistor R8. One end of the second pull-down resistor R8 is electrically connected to one end of the capacitor C. One end of the capacitor C is electrically connected to one end of the third current-limiting resistor R9. The other end of the second pull-down resistor R8, the other end of the capacitor C, and the source of the third MOSFET Q4 are all grounded.

[0058] In this embodiment, both the second MOS transistor and the third MOS transistor are NMOS transistors.

[0059] In this embodiment, the second pull-down resistor R8 has a resistance of 100KΩ, the third current-limiting resistor R9 has a resistance of 15.4KΩ, and the capacitor C has a capacitance of 10μF.

[0060] In an alternative embodiment, such as Figure 1 As shown, the low-voltage power supply switching circuit includes a fourth MOSFET Q5, a fourth current-limiting resistor R10, and a third pull-up resistor R11.

[0061] The gate of the fourth MOSFET Q5 is electrically connected to one end of the fourth current-limiting resistor R10, and the other end of the fourth current-limiting resistor R10 is electrically connected to the main power switch circuit. The drain of the fourth MOSFET Q5 is electrically connected to one end of the third pull-up resistor R11, and the other end of the third pull-up resistor R11 is electrically connected to the main power supply. The source of the fourth MOSFET Q5 is grounded.

[0062] In this embodiment, the fourth MOS transistor is an NMOS transistor.

[0063] In this embodiment, the resistance value of the fourth current-limiting resistor R10 is 0Ω and the resistance value of the third pull-up resistor R11 is 2KΩ.

[0064] It should be noted that when Q5 is an NMOS transistor, the fourth current-limiting resistor R10 is not needed in the circuit (i.e., the fourth current-limiting resistor R10 does not exist, and its resistance value is 0Ω). When Q5 is a transistor, the fourth current-limiting resistor R10 exists, and its resistance value is 1KΩ.

[0065] In the specific implementation process, the process of turning on the printer power is as follows: When the power switch button S1 is pressed and the printer power is turned on momentarily, the printer power is still in the on state after the power switch button S1 is released. The first MOSFET Q2 is not turned on, and the main power supply (e.g., 5V) is started. When the main power supply is started, the low voltage power supply (e.g., 3.3V) is formed. It should be noted that all low voltage power supplies depend on the main power supply (e.g., the 3.3V power supply depends on the 5V power supply).

[0066] Furthermore, when the low-voltage power supply (e.g., 3.3V) is formed, the second MOSFET Q3 is turned on, forming a self-locking circuit, while the first MOSFET Q2 remains off. At this time, the printer remains powered on. When the power is on, turning the power switch button S1 on or off does not affect the power-on state of the printer.

[0067] The process of turning off the printer power is as follows: When the power switch button S1 is pressed and held (S1 is on), the input signal is sent to the main control chip through the first transistor Q1. The main control chip outputs a power off signal to the third current limiting resistor R9. The PER-OFF output is high level, and the third MOSFET Q4 is turned on through the third current limiting resistor R9. When the third MOSFET Q4 is turned on, the second MOSFET Q3 is in the off state, and the first MOSFET Q2 is turned on. At this time, the main power supply (e.g., 5V) is off, and the low voltage power supply (e.g., 3.3V) is also off.

[0068] This embodiment reduces the cost of ordinary power-starting circuits and improves the flexibility of power-starting characteristics by coordinating the switching signal circuit, drive circuit, power switch button, main power switch circuit, self-locking circuit, shutdown signal circuit and low-voltage power switch circuit in the printer power-starting circuit.

[0069] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A printer power-on circuit, characterized in that, It includes a switch signal circuit, a drive circuit, a power switch button, a main power switch circuit, a self-locking circuit, a shutdown signal circuit, and a low-voltage power switch circuit. The switch signal circuit, the drive circuit, the power switch button, the main power switch circuit, the self-locking circuit, and the shutdown signal circuit are electrically connected to the low-voltage power switch circuit. The switch signal circuit is used to transmit the press command of the printer power switch button to the main control chip; The driving circuit is used to drive the first transistor to conduct and control the first MOSFET to turn off; The power switch button is used to control the on or off of the printer's power-on circuit. The main power switch circuit is used to control the main power supply to be turned on or off. The self-locking circuit is used to control the first MOSFET to remain off; The shutdown signal circuit is used to control the main power supply to shut down; The low-voltage power supply switching circuit is used to generate a low-voltage power supply.

2. The printer power-on circuit as described in claim 1, characterized in that, The switching signal circuit includes a first pull-up resistor and a first transistor; One end of the first pull-up resistor is electrically connected to the low-voltage power supply, the other end of the first pull-up resistor is electrically connected to the collector of the first transistor, the emitter of the first transistor is grounded, and the base of the first transistor is electrically connected to the driving circuit.

3. The printer power-on circuit as described in claim 1, characterized in that, The driving circuit includes a second pull-up resistor, a first pull-down resistor, and a first current-limiting resistor; One end of the first current-limiting resistor is electrically connected to the base of the first transistor, and the other end of the first current-limiting resistor is electrically connected to one end of the second pull-up resistor, one end of the first pull-down resistor, and one end of the power switch button. The other end of the second pull-up resistor is electrically connected to the low-voltage power supply, and the other end of the first pull-down resistor is grounded.

4. The printer power-on circuit as described in claim 1, characterized in that, The main power switch circuit includes a first MOSFET, a first voltage divider resistor, and a second voltage divider resistor. One end of the first voltage divider resistor is electrically connected to one end of the second voltage divider resistor, the other end of the power switch button, and the gate of the first MOS transistor. The other end of the first voltage divider resistor is electrically connected to an external power supply. The other end of the second voltage divider resistor is grounded. The drain of the first MOS transistor is electrically connected to the main power supply. The source of the first MOS transistor is grounded.

5. The printer power-on circuit as described in claim 1, characterized in that, The self-locking circuit includes a second MOS transistor and a second current-limiting resistor; The drain of the second MOS transistor is electrically connected to the other end of the power switch button, the gate of the second MOS transistor is electrically connected to one end of the second current-limiting resistor, the source of the second MOS transistor is grounded, and the other end of the second current-limiting resistor is electrically connected to the low-voltage power supply.

6. The printer power-on circuit as described in claim 5, characterized in that, The shutdown signal circuit includes a third MOSFET, a second pull-down resistor, a third current-limiting resistor, and a capacitor; The drain of the third MOS transistor is electrically connected to one end of the second current-limiting resistor and the gate of the second MOS transistor, respectively. The gate of the third MOS transistor is electrically connected to one end of the second pull-down resistor, one end of the second pull-down resistor is electrically connected to one end of the capacitor, one end of the capacitor is electrically connected to one end of the third current-limiting resistor, and the other end of the second pull-down resistor, the other end of the capacitor, and the source of the third MOS transistor are all grounded.

7. The printer power-on circuit as described in claim 1, characterized in that, The low-voltage power supply switching circuit includes a fourth MOSFET, a fourth current-limiting resistor, and a third pull-up resistor; The gate of the fourth MOS transistor is electrically connected to one end of the fourth current-limiting resistor, the other end of the fourth current-limiting resistor is electrically connected to the main power switch circuit, the drain of the fourth MOS transistor is electrically connected to one end of the third pull-up resistor, the other end of the third pull-up resistor is electrically connected to the main power supply, and the source of the fourth MOS transistor is grounded.

8. The printer power-on circuit as described in claim 1, characterized in that, The first transistor is a PNP transistor, and the first MOSFET is an NMOS transistor.

9. The printer power-on circuit as described in claim 6, characterized in that, Both the second MOS transistor and the third MOS transistor are NMOS transistors.

10. The printer power-on circuit as described in claim 7, characterized in that, The fourth MOS transistor is an NMOS transistor.

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