Printer power-on startup circuit

Abstract

The utility model relates to a printer power-on start-up circuit, a power supply management module electrically connected with a power supply is arranged in a printer, the output end of the power supply management module is electrically connected with a load in the printer, and the printer power-on start-up circuit is characterized by comprising a first control unit, a second control unit and a control unit, the control module is electrically connected with the power supply and the control port of the power management module and is used for sending an enable signal to the control port of the power management module after the power supply is powered on; and the second control unit is electrically connected with the power supply end of the power supply management module and the control port of the power supply management module, and the second control unit is configured to continuously send an enable signal to the control port of the power supply management module after the power supply management module is electrified, so that the power supply management module can supply power to a load in the printer. The printer power-on starting-up circuit is simple, the whole power-on action can be completed through cooperation of the first control unit and the second control unit, and automatic starting-up of the printer after the power supply is powered on is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a power-on circuit for a printer. Background Art

[0002] When an inkjet printer is powered on, the print head will perform a cleaning action at regular intervals to ensure the normal operation of the print head. If the power is suddenly cut off and then restored, users often neglect to turn on the inkjet printer. When using the inkjet printer, the ink in the print head will dry out due to the lack of automatic cleaning for a long time, and finally the print head will be blocked and unable to be used normally.

[0003] In order to power on and start the printer after power-on, a Chinese utility model patent with the patent number ZL201820612160.5 (the authorized announcement number is CN208063166U) discloses a power-on circuit and a printer. The power-on circuit is used to control the disconnection and closure of the key switch of the printer. The power-on circuit includes: a timing circuit, a control circuit and the key switch; the timing circuit includes a first voltage source, a timer, a first capacitor, a second capacitor and a sliding rheostat; the control circuit includes an LED lamp, a second voltage source, a diode, a protection resistor, a first switching tube and a relay, and a relay switch and a second switching tube of the relay; the output end of the timing circuit is connected to the input end of the control circuit, and the second switching tube in the control circuit is used to connect with the key switch to control the disconnection and closure of the key switch.

[0004] Although the power-on circuit can control the opening and closing of the printer through power-on, since the power-on circuit controls the working duration of the printer through a timer, the key switch will disconnect after the timing duration of the timer reaches the set value. However, if the timing duration of the timer is too short, it will affect the power-on of the printer, so there will still be a situation where the print head is blocked. Therefore, it is necessary to further improve the existing technology. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a power-on circuit for a printer that can realize complete power-on of the printer in view of the above-mentioned prior art.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a power-on circuit for a printer. A power management module electrically connected to a power supply is provided in the printer. The output end of the power management module is electrically connected to a load in the printer. The power-on circuit for the printer includes:

[0007] A first control unit, which is electrically connected to the power supply and the control port of the power management module respectively, and is used to send an enabling signal to the control port of the power management module after the power supply is powered on; and

[0008] A second control unit, electrically connected to the power supply terminal of the power management module and the control port of the power management module, is configured to: continuously send an enabling signal to the control port of the power management module after the power management module is powered on, so as to enable the power management module to supply power to the loads in the printer.

[0009] Preferably, the printer power-on circuit further includes a first switching device. The control end of the first switching device is electrically connected to the first control unit and to the power supply, the first end of the first switching device is connected to the control port of the power management module, and the second end of the first switching device is grounded.

[0010] Preferably, the first switching device is a first MOS transistor. The control end of the first switching device is the gate of the first MOS transistor, the first end of the first switching device is the drain of the first MOS transistor, and the second end of the first switching device is the source of the first MOS transistor.

[0011] There are many types of circuits for the above-mentioned first control unit. Preferably, the first control unit includes a first capacitor and a second switching device. One end of the first capacitor is connected to the power supply. The first capacitor is electrically connected to the control end of the second switching device. The first end of the second switching device is connected to the control end of the first switching device, and the second end of the second switching device is grounded.

[0012] Specifically, the second switching device is a triode. The control end of the second switching device is the base of the triode, the first end of the second switching device is the collector of the triode, and the second end of the second switching device is the emitter of the triode.

[0013] In the present utility model, the second control unit includes a third switching device. The control end of the third switching device is connected to the power supply terminal of the power management module. The first end of the third switching device is connected between the first end of the second switching device and the control end of the first switching device, and the second end of the third switching device is grounded.

[0014] Preferably, the third switching device is a second MOS transistor. The control end of the third switching device is the gate of the second MOS transistor, the first end of the third switching device is the drain of the second MOS transistor, and the second end of the third switching device is the source of the second MOS transistor.

[0015] In order to drive the second MOS transistor to conduct, the second control unit further includes a first voltage dividing circuit. The first input terminal of the first voltage dividing circuit is connected to the power supply terminal of the power management module. The second input terminal of the first voltage dividing circuit is grounded. The output terminal of the first voltage dividing circuit is connected to the control end of the third switching device.

[0016] Preferably, the first voltage dividing circuit includes an eighth resistor and a tenth resistor connected in series. One end of the eighth resistor corresponds to the first input terminal of the first voltage dividing circuit, one end of the tenth resistor corresponds to the second input terminal of the first voltage dividing circuit, and the connection line between the other ends of the eighth resistor and the tenth resistor corresponds to the output terminal of the first voltage dividing circuit.

[0017] Compared with the prior art, the advantages of the present invention are as follows: after the power supply is powered on, the first control unit sends an enable signal to the control port of the power management module, so as to realize the short-term operation of the power management module; in addition, when the power management module operates briefly, it powers the second control unit, and the second control unit can continuously send an enable signal to the control port of the power management module. Therefore, the power-on circuit of the printer is simple, and the entire power-on operation can be completed through the cooperation of the first control unit and the second control unit, realizing automatic startup of the printer after the power supply is powered on. In addition, it can ensure that the print head of the inkjet printer can be cleaned in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic block diagram of the power-on circuit of the printer in the embodiment of the present invention;

[0019] Figure 2 is Figure 1 the specific circuit diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present invention will be further described in detail below in conjunction with the embodiments of the accompanying drawings.

[0021] A power management module 1 electrically connected to the power supply VCC is provided in the printer, and the output terminal of the power management module 1 is electrically connected to the load in the printer. As Figure 2 shown, the power management module 1 in this embodiment is a DC-DC power chip, which is used to convert the voltage of the power supply VCC for powering the load, and the load can be the main control chip in the printer and its bypass.

[0022] As Figure 1 and Figure 2As shown in the figure, the power-on circuit of the printer in this embodiment includes a first control unit 2, a second control unit 3, and a first switching device 4. The first control unit 2 is electrically connected to the power supply VCC and the control port of the power management module 1 respectively, and is used to send an enable signal to the control port of the power management module 1 after the power supply VCC is powered on; the second control unit 3 is electrically connected to the power supply terminal of the power management module 1 and the control port of the power management module 1. The second control unit 3 is configured to: continuously send an enable signal to the control port of the power management module 1 after the power management module 1 is powered on, so that the power management module 1 can supply power to the loads in the printer. In this embodiment, the voltage of the power supply VCC is 30V, and the voltage output by the power supply terminal of the power management module 1 is VDD (3.3V).

[0023] The control end of the first switching device 4 is electrically connected to the first control unit 2 and is also electrically connected to the power supply VCC. The first end of the first switching device 4 is connected to the control port of the power management module 1, and the second end of the first switching device 4 is grounded. As Figure 2 shown in the figure, the first switching device 4 in this embodiment is a first MOS transistor Q2. The control end of the first switching device 4 is the gate of the first MOS transistor Q2, the first end of the first switching device 4 is the drain of the first MOS transistor Q2, and the second end of the first switching device 4 is the source of the first MOS transistor Q2.

[0024] As Figure 2 shown in the figure, the first control unit 2 includes a first capacitor C1 and a second switching device 21. One end of the first capacitor C1 is connected to the power supply VCC. The first capacitor C1 is electrically connected to the control end of the second switching device 21. The first end of the second switching device 21 is connected to the control end of the first switching device 4, and the second end of the second switching device 21 is grounded. The first capacitor C1 in this embodiment is a capacitor that can charge and discharge; the second switching device 21 is a triode Q1. The control end of the second switching device 21 is the base of the triode Q1, the first end of the second switching device 21 is the collector of the triode Q1, and the second end of the second switching device 21 is the emitter of the triode Q1.

[0025] In addition, in order to ensure the normal operation of the triode Q1 and the first MOS transistor Q2, the base of the triode Q1 and the gate of the first MOS transistor Q2 are also connected with a peripheral circuit (specifically, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, etc.). This peripheral circuit is a prior art and will not be elaborated here.

[0026] The power supply VCC is also connected to one end of the first capacitor C1 through a second voltage dividing circuit 23. Specifically, as Figure 2As shown, the second voltage dividing circuit 23 in this embodiment includes a first resistor R1 and a third resistor R3 connected in series. One end of the first resistor R1 is connected to the power supply VCC, one end of the third resistor R3 is grounded, and one end of the first capacitor C1 is connected between the connection line of the first resistor R1 and the third resistor R3.

[0027] As Figure 2 shown, the second control unit 3 includes a third switching device 31 and a first voltage dividing circuit 32. The control end of the third switching device 31 is connected to the power supply end of the power management module 1. The first end of the third switching device 31 is connected between the first end of the second switching device 21 and the control end of the first switching device 4, and the second end of the third switching device 31 is grounded; specifically, the first input end of the first voltage dividing circuit 32 is connected to the power supply end of the power management module 1, the second input end of the first voltage dividing circuit 32 is grounded, and the output end of the first voltage dividing circuit 32 is connected to the control end of the third switching device 31.

[0028] The third switching device 31 in this embodiment is a second MOS transistor Q3. The control end of the third switching device 31 is the gate of the second MOS transistor Q3, the first end of the third switching device 31 is the drain of the second MOS transistor Q3, and the second end of the third switching device 31 is the source of the second MOS transistor Q3.

[0029] The first voltage dividing circuit 32 in this embodiment includes an eighth resistor R8 and a tenth resistor R10 connected in series. One end of the eighth resistor R8 corresponds to the first input end of the first voltage dividing circuit 32, one end of the tenth resistor R10 corresponds to the second input end of the first voltage dividing circuit 32, and the connection line between the other end of the eighth resistor R8 and the other end of the tenth resistor R10 corresponds to the output end of the first voltage dividing circuit 32.

[0030] The working process of the printer power-on circuit in this embodiment is as follows:

[0031] When the power supply VCC is powered on, the first capacitor C1 has a short charging process. At this time, there is a short voltage at the base of the triode Q1, and this short voltage will cause the triode Q1 to conduct; since the collector of the triode Q1 is connected to the gate of the first MOS transistor Q2, the gate voltage of the first MOS transistor Q2 becomes low, and the first MOS transistor Q2 is turned off, so the control port (RST_CMBO) of the DC-DC power chip is pulled high, and then the DC-DC power chip works;

[0032] Since the DC-DC power chip outputs a voltage of 3.3V (VDD) when working, the 3.3V voltage makes the gate of the second MOS transistor Q3 at a high level, and the first MOS transistor Q2 remains in the off state; at this time, the control port (RST_CMBO) of the DC-DC power chip is pulled high, so it can supply power to the load in the printer.

[0033] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A power-on circuit for a printer. There is a power management module (1) electrically connected to a power supply (VCC) inside the printer. The output terminal of the power management module (1) is electrically connected to a load inside the printer, and it is characterized in that The printer power-on circuit includes: A first control unit (2), electrically connected to the control port of the power supply (VCC) and the power management module (1) respectively, for sending an enable signal to the control port of the power management module (1) after the power supply (VCC) is powered on; and A second control unit (3), electrically connected to the power terminal of the power management module (1) and the control port of the power management module (1), and the second control unit (3) is configured to: continuously send an enable signal to the control port of the power management module (1) after the power management module (1) is powered on, so as to enable the power management module (1) to supply power to the loads in the printer.

2. The printer power-on circuit according to claim 1, characterized in that: The printer power-on circuit further includes a first switching device (4), the control end of the first switching device (4) is electrically connected to the first control unit (2) and to the power supply (VCC), the first end of the first switching device (4) is connected to the control port of the power management module (1), and the second end of the first switching device (4) is grounded.

3. The printer power-on circuit according to claim 2, characterized in that: The first switching device (4) is a first MOS transistor (Q2), the control end of the first switching device (4) is the gate of the first MOS transistor (Q2), the first end of the first switching device (4) is the drain of the first MOS transistor (Q2), and the second end of the first switching device (4) is the source of the first MOS transistor (Q2).

4. The printer power-on circuit according to claim 2, wherein: The first control unit (2) includes a first capacitor (C1) and a second switching device (21), one end of the first capacitor (C1) is connected to the power supply (VCC), the first capacitor (C1) is electrically connected to the control end of the second switching device (21), the first end of the second switching device (21) is connected to the control end of the first switching device (4), and the second end of the second switching device (21) is grounded.

5. The printer power-on circuit according to claim 4, wherein: The second switching device (21) is a triode (Q1), the control end of the second switching device (21) is the base of the triode (Q1), the first end of the second switching device (21) is the collector of the triode (Q1), and the second end of the second switching device (21) is the emitter of the triode (Q1).

6. The printer power-on circuit according to claim 4, characterized in that: The second control unit (3) includes a third switching device (31), the control end of the third switching device (31) is connected to the power terminal of the power management module (1), the first end of the third switching device (31) is connected between the first end of the second switching device (21) and the control end of the first switching device (4), and the second end of the third switching device (31) is grounded.

7. The printer power-on circuit according to claim 6, wherein: The third switching device (31) is a second MOS transistor (Q3), the control end of the third switching device (31) is the gate of the second MOS transistor (Q3), the first end of the third switching device (31) is the drain of the second MOS transistor (Q3), and the second end of the third switching device (31) is the source of the second MOS transistor (Q3).

8. The printer power-on circuit according to claim 7, characterized in that: The second control unit (3) further includes a first voltage dividing circuit (32). A first input end of the first voltage dividing circuit (32) is connected to the power supply end of the power management module (1), a second input end of the first voltage dividing circuit (32) is grounded, and an output end of the first voltage dividing circuit (32) is connected to the control end of the third switching device (31).

9. The printer power-on circuit according to claim 8, characterized in that: The first voltage dividing circuit (32) includes an eighth resistor (R8) and a tenth resistor (R10) connected in series. One end of the eighth resistor (R8) corresponds to the first input end of the first voltage dividing circuit (32), one end of the tenth resistor (R10) corresponds to the second input end of the first voltage dividing circuit (32), and a connection line between the other ends of the eighth resistor (R8) and the tenth resistor (R10) corresponds to the output end of the first voltage dividing circuit (32).

Images