Power supply control circuit, circuit board and printer of printer

Abstract

This invention discloses a power supply control circuit, circuit board, and printer for a printer, including a first PTC resistor, a first switching transistor, a first DC power supply terminal, a pre-power-on trigger terminal for acquiring a pre-power-on trigger signal, a second switching transistor, and a first capacitor. The pre-power-on trigger terminal is connected to the control pin of the first switching transistor. One switch pin of the first switching transistor is connected to the first DC power supply terminal, and the other switch pin is connected to one end of the first PTC resistor. The other end of the first PTC resistor serves as the output terminal of the MCU pre-power-on module to provide power to the MCU module. The output terminal of the MCU module is connected to the control pin of the second switching transistor. One switch pin of the second switching transistor is connected to the first DC power supply terminal, and the other switch pin of the second switching transistor is connected to the output terminal of the MCU pre-power-on module and grounded through the first capacitor. This power supply control circuit can effectively reduce the current at the moment of power-on and improve the reliability of the circuit.

Description

Technical Field

[0001] This invention relates to the field of printer circuit technology, and more particularly to a power supply control circuit, circuit board, and printer for a printer. Background Technology

[0002] Currently, printer power supply circuits typically contain capacitors with large capacitance values. Due to the characteristic that capacitors pass AC and block DC, even in a DC circuit, the moment power is applied, the charging of the capacitor is equivalent to AC current flow, generating a large current instantaneously. This can cause significant damage to the capacitor, input circuit, input power supply, and load, affecting the reliability of the circuit. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a power supply control circuit, circuit board and printer for a printer, which can effectively reduce the current at the moment of power-on and improve the reliability of the circuit.

[0004] In a first aspect, embodiments of the present invention provide a power supply control circuit for a printer, including an MCU pre-power-on module and an MCU formal power supply circuit, wherein:

[0005] The MCU pre-power-on module includes a first PTC resistor, a first switching transistor, a first DC power supply terminal, and a pre-power-on trigger terminal for acquiring a pre-power-on trigger signal. The pre-power-on trigger terminal is connected to the control pin of the first switching transistor. One switch pin of the first switching transistor is connected to the first DC power supply terminal, and the other switch pin is connected to one end of the first PTC resistor. The other end of the first PTC resistor serves as the output terminal of the MCU pre-power-on module to provide power to the MCU module.

[0006] The MCU power supply circuit includes a second switching transistor and a first capacitor. The output terminal of the MCU module is connected to the control pin of the second switching transistor. One switching pin of the second switching transistor is connected to the first DC power supply terminal. The other switching pin of the second switching transistor is connected to the output terminal of the MCU pre-power-on module and grounded through the first capacitor.

[0007] The power supply control circuit provided by the embodiments of the present invention has at least the following beneficial effects: When the pre-power-on trigger terminal obtains the pre-power-on trigger signal, the first switching transistor can be triggered to conduct through the control pin of the first switching transistor, thereby enabling the first DC power supply terminal to provide power to the MCU module through the first switching transistor and the first PTC resistor. Due to the current limiting effect of the first PTC resistor, the charging current of the first capacitor at the moment of power-on can be reduced, avoiding impact on the MCU module. Since the first PTC resistor consumes electrical energy, it cannot be used for power supply for a long time. After the first capacitor is charged, the second switching transistor can be controlled to conduct through the output terminal of the MCU module, thereby enabling the first DC power supply terminal to provide power to the MCU module through the second switching transistor, eliminating the need for the MCU pre-power-on module to provide power, and avoiding the problem of input current limitation caused by the temperature rise of the first PTC resistor. This power supply control circuit can effectively reduce the current at the moment of power-on and improve the working reliability of the circuit.

[0008] In some embodiments, the power supply control circuit also includes a DC load pre-power-on circuit and a DC load formal power supply circuit.

[0009] The DC load pre-power-on circuit includes a second PTC resistor, a third switch transistor, and a second DC power supply terminal. The MCU module is also connected to the control pin of the third switch transistor. One switch pin of the third switch transistor is connected to the second DC power supply terminal, and the other switch pin is connected to one end of the second PTC resistor. The other end of the second PTC resistor serves as the output terminal of the DC load pre-power-on circuit to provide power to the DC load.

[0010] The DC load power supply circuit includes a fourth switch and a second capacitor. The output of the MCU module is also connected to the control pin of the fourth switch. One switch pin of the fourth switch is connected to the second DC power supply terminal, and the other switch pin of the fourth switch is connected to the output of the DC load pre-power-on circuit and grounded through the second capacitor.

[0011] In some embodiments of the power supply control circuit, the DC load pre-power-on circuit further includes a first flip-flop disposed between the output terminal of the MCU module and the control pin of the third switching transistor; the DC load formal power supply circuit further includes a second flip-flop disposed between the output terminal of the MCU module and the control pin of the fourth switching transistor; the power supply control circuit further includes a printer cover opening signal receiving terminal, which is connected to the input terminals of the first flip-flop and the second flip-flop respectively.

[0012] In some embodiments of the power supply control circuit, the first switching transistor is a PMOS transistor, and the MCU pre-power-on module further includes a first resistor, a second resistor and a pre-power-on button. The first DC power supply terminal is connected to the source of the first switching transistor and one end of the first resistor. The other end of the first resistor is connected to the gate of the first switching transistor and one end of the second resistor. The other end of the second resistor is grounded through the pre-power-on button.

[0013] In some embodiments of the power supply control circuit, the MCU pre-power-on module further includes a first diode disposed between the second resistor and the pre-power-on button.

[0014] In some embodiments of the power supply control circuit, the second switching transistor is a PMOS transistor. The MCU power supply circuit further includes a third resistor, a fourth resistor, a fifth resistor, and a fifth switching transistor. The first DC power supply terminal is connected to the source of the second switching transistor and one end of the third resistor. The other end of the third resistor is connected to the gate of the second switching transistor and one end of the fourth resistor. The other end of the fourth resistor is connected to one switching pin of the fifth switching transistor. The other switching pin of the fifth switching transistor is grounded. The output terminal of the MCU module is connected to the control pin of the fifth switching transistor through the fifth resistor.

[0015] In some embodiments of the power supply control circuit, the third switching transistor is a PMOS transistor, and the DC load pre-power-on circuit further includes a sixth resistor, a seventh resistor, an eighth resistor, and a sixth switching transistor. The second DC power supply terminal is connected to the source of the third switching transistor and one end of the sixth resistor. The other end of the sixth resistor is connected to the gate of the third switching transistor and one end of the seventh resistor. The other end of the seventh resistor is connected to one switching pin of the sixth switching transistor. The other switching pin of the sixth switching transistor is grounded. The output terminal of the MCU module is connected to the control pin of the sixth switching transistor through the eighth resistor.

[0016] In some embodiments of the power supply control circuit, the fourth switch is a PMOS transistor, and the DC load power supply circuit further includes a ninth resistor, a tenth resistor, an eleventh resistor, and a seventh switch. The second DC power supply terminal is connected to the source of the fourth switch and one end of the ninth resistor. The other end of the ninth resistor is connected to the gate of the fourth switch and one end of the tenth resistor. The other end of the tenth resistor is connected to one switch pin of the seventh switch. The other switch pin of the seventh switch is grounded. The output terminal of the MCU module is connected to the control pin of the seventh switch through the eleventh resistor.

[0017] In a second aspect, embodiments of the present invention provide a circuit board including the power supply control circuit described in the first aspect embodiment above.

[0018] The circuit board provided according to the embodiments of the present invention has at least the following beneficial effects: When the pre-power-on trigger terminal of the power supply control circuit obtains the pre-power-on trigger signal, it can trigger the first switching transistor to conduct through the control pin of the first switching transistor, thereby enabling the first DC power supply terminal to provide power to the MCU module through the first switching transistor and the first PTC resistor. Due to the current limiting effect of the first PTC resistor, the charging current of the first capacitor at the moment of power-on can be reduced, avoiding impact on the MCU module. Since the first PTC resistor consumes electrical energy, it cannot be powered for a long time. After the first capacitor is charged, the second switching transistor can be controlled to conduct through the output terminal of the MCU module, thereby enabling the first DC power supply terminal to provide power to the MCU module through the second switching transistor, eliminating the need for the MCU pre-power-on module to provide power, and avoiding the problem of input current limitation caused by the temperature rise of the first PTC resistor. The circuit board can effectively reduce the current at the moment of power-on and improve the working reliability of the circuit.

[0019] Thirdly, embodiments of the present invention provide a printer, including the circuit board described in the second aspect of the embodiments above.

[0020] The printer provided according to the embodiments of the present invention has at least the following beneficial effects: When the pre-power-on trigger terminal of the power supply control circuit obtains the pre-power-on trigger signal, it can trigger the first switching transistor to conduct through the control pin of the first switching transistor, thereby enabling the first DC power supply terminal to provide power to the MCU module through the first switching transistor and the first PTC resistor. Due to the current limiting effect of the first PTC resistor, the charging current of the first capacitor at the moment of power-on can be reduced, avoiding impact on the MCU module. Since the first PTC resistor consumes electrical energy, it cannot be powered for a long time. After the first capacitor is charged, the second switching transistor can be controlled to conduct through the output terminal of the MCU module, thereby enabling the first DC power supply terminal to provide power to the MCU module through the second switching transistor, eliminating the need for the MCU pre-power-on module to provide power, and avoiding the problem of input current limitation caused by the temperature rise of the first PTC resistor. The circuit board can effectively reduce the current at the moment of power-on and improve the reliability of the circuit.

[0021] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0022] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 This is a circuit diagram of a power supply control circuit for a printer provided in an embodiment of the present invention. Detailed Implementation

[0025] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0026] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0027] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0028] This invention provides a power supply control circuit, circuit board, and printer for a printer, which can effectively reduce the current at the moment of power-on and improve the reliability of the circuit.

[0029] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0030] Reference Figure 1 A first aspect of the present invention provides a power supply control circuit for a printer, including an MCU pre-power-on module 100 and an MCU formal power supply circuit 200, wherein:

[0031] The MCU pre-power-on module 100 includes a first PTC resistor PTC1, a first switch Q1, a first DC power supply terminal 24VIn, and a pre-power-on trigger terminal 110 for acquiring a pre-power-on trigger signal. The pre-power-on trigger terminal 110 is connected to the control pin of the first switch Q1. One switch pin of the first switch Q1 is connected to the first DC power supply terminal 24VIn, and the other switch pin is connected to one end of the first PTC resistor PTC1. The other end of the first PTC resistor PTC1 serves as the output terminal of the MCU pre-power-on module 100 to provide power to the MCU module 500.

[0032] The MCU power supply circuit 200 includes a second switch Q2 and a first capacitor C1. The output of the MCU module 500 is connected to the control pin of the second switch Q2. One switch pin of the second switch Q2 is connected to the first DC power supply terminal 24VIn. The other switch pin of the second switch Q2 is connected to the output of the MCU pre-power-on module 100 and grounded through the first capacitor C1.

[0033] According to the power supply control circuit provided in the embodiment of the present invention, when the pre-power-on trigger terminal 110 obtains the pre-power-on trigger signal, it can trigger the first switch Q1 to conduct through the control pin of the first switch Q1, thereby enabling the first DC power supply terminal 24VIn to supply power to the MCU module 500 through the first switch Q1 and the first PTC resistor PTC1. Due to the current limiting effect of the first PTC resistor PTC1, the charging current of the first capacitor C1 at the moment of power-on can be reduced, avoiding impact on the MCU module 500. Since the first PTC resistor PTC1 consumes electrical energy, it cannot be used for power supply for a long time. After the first capacitor C1 is charged, the second switch Q2 can be controlled to conduct through the output terminal of the MCU module 500, thereby enabling the first DC power supply terminal 24VIn to supply power to the MCU module 500 through the second switch Q2, eliminating the need for power supply from the MCU pre-power-on module 100, and avoiding the problem of input current limitation caused by the temperature rise of the first PTC resistor PTC1. This power supply control circuit can effectively reduce the current at the moment of power-on and improve the reliability of the circuit.

[0034] It is understandable that there can be two PTC resistors, PTC1, as shown in the reference. Figure 1 The two first PTC resistors, PTC1, are connected in parallel.

[0035] Reference Figure 1 In some embodiments, the power supply control circuit also includes a DC load pre-power-on circuit 300 and a DC load formal power supply circuit 400.

[0036] The DC load pre-power-on circuit 300 includes a second PTC resistor PTC2, a third switch Q3, and a second DC power supply terminal 24V-MOT. The MCU module 500 is also connected to the control pin of the third switch Q3. One switch pin of the third switch Q3 is connected to the second DC power supply terminal 24V-MOT, and the other switch pin is connected to one end of the second PTC resistor PTC2. The other end of the second PTC resistor PTC2 serves as the output terminal of the DC load pre-power-on circuit 300 to provide power to the DC load.

[0037] The DC load power supply circuit 400 includes a fourth switch Q4 and a second capacitor C2. The output of the MCU module 500 is also connected to the control pin of the fourth switch Q4. One switch pin of the fourth switch Q4 is connected to the second DC power supply terminal 24V-MOT, and the other switch pin of the fourth switch Q4 is connected to the output of the DC load pre-power-on circuit 300 and grounded through the second capacitor C2.

[0038] In this embodiment, when the MCU module 500 is powered on and needs to supply power to the DC load, the MCU module 500 first controls the third switch Q3 to turn on, so that the second DC power supply terminal 24V-MOT provides power to the DC load through the third switch Q3 and the second PTC resistor PTC2, for example, referring to... Figure 1 The DC load is powered through port M24V. Due to the current limiting effect of the second PTC resistor PTC2, the charging current of the second capacitor C2 at the moment of power-on can be reduced, avoiding impact on the DC load. Since the second PTC resistor PTC2 consumes electrical energy, it cannot be used to power the DC load for a long time. After the second capacitor C2 is charged, the output terminal of the MCU module 500 can control the fourth switch Q4 to turn on, so that the second DC power supply terminal 24V-MOT can provide power to the DC load through the fourth switch Q4, without the need for the DC load pre-power-on circuit 300 to provide power, and also avoiding the problem of input current limitation caused by the temperature rise of the second PTC resistor PTC2.

[0039] It is understandable that there can be two PTC resistors, PTC2, as shown in the reference. Figure 1 The two second PTC resistors, PTC2, are connected in parallel.

[0040] Reference Figure 1In some embodiments of the power supply control circuit, the DC load pre-power-on circuit 300 further includes a first flip-flop U56D disposed between the output terminal of the MCU module 500 and the control pin of the third switch Q3; the DC load formal power supply circuit 400 further includes a second flip-flop U56C disposed between the output terminal of the MCU module 500 and the control pin of the fourth switch Q4; the power supply control circuit further includes a printer cover opening signal receiver OpenCover, which is connected to the input terminals of the first flip-flop U56D and the second flip-flop U56C respectively.

[0041] In this embodiment, when the printer is detected to be in an open state, an open cover signal can be sent to the printer open cover signal receiving terminal OpenCover of this circuit, thereby causing the first flip-flop U56D and the second flip-flop U56C to be in a latched state, preventing the signal output by the MCU module 500 from being transmitted to the third switch Q3 and the fourth switch Q4, thus stopping the power supply to the DC load, such as stopping the power supply to the heating roller heating module, motor, etc.

[0042] Reference Figure 1 In some embodiments of the power supply control circuit, the first switching transistor Q1 is a PMOS transistor, and the MCU pre-power-on module 100 also includes a first resistor R1, a second resistor R2 and a pre-power-on button S1. The first DC power supply terminal 24VIn is connected to the source of the first switching transistor Q1 and one end of the first resistor R1. The other end of the first resistor R1 is connected to the gate of the first switching transistor Q1 and one end of the second resistor R2. The other end of the second resistor R2 is grounded through the pre-power-on button S1.

[0043] In this embodiment, when the pre-power-on button S1 is not pressed, the gate-source voltage of the first switch Q1 is relatively large, and the first switch Q1 is in the off state. The first DC power supply terminal 24VIn cannot supply power to the MCU module 500 through the first switch Q1 and the first PTC resistor PTC1. When the pre-power-on button S1 is pressed, the power supply of the first DC power supply terminal 24VIn is grounded through the first resistor R1, the second resistor R2 and the pre-power-on button S1. Under the voltage division effect of the first resistor R1 and the second resistor R2, the gate-source voltage of the first switch Q1 is low, and the first switch Q1 becomes in the on state. The first DC power supply terminal 24VIn can supply power to the MCU module 500 through the first switch Q1 and the first PTC resistor PTC1.

[0044] Reference Figure 1 In some embodiments of the power supply control circuit, the MCU pre-power-on module 100 further includes a first diode D1 disposed between the second resistor R2 and the pre-power-on button S1.

[0045] Reference Figure 1 In some embodiments of the power supply control circuit, the second switch Q2 is a PMOS transistor. The MCU power supply circuit 200 also includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a fifth switch Q5. The first DC power supply terminal 24VIn is connected to the source of the second switch Q2 and one end of the third resistor R3. The other end of the third resistor R3 is connected to the gate of the second switch Q2 and one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to one switch pin of the fifth switch Q5. The other switch pin of the fifth switch Q5 is grounded. The output terminal of the MCU module 500 is connected to the control pin of the fifth switch Q5 through the fifth resistor R5.

[0046] In this embodiment, when the fifth switch Q5 is in the off state, the gate-source voltage of the second switch Q2 is relatively large, and the second switch Q2 is also in the off state. The first DC power supply terminal 24VIn cannot supply power to the MCU module 500. When the output terminal of the MCU module 500 triggers the fifth switch Q5 to become on, the power supply of the first DC power supply terminal 24VIn is grounded through the third resistor R3, the fourth resistor R4 and the fifth switch Q5. Under the voltage division effect of the third resistor R3 and the fourth resistor R4, the gate-source voltage of the second switch Q2 is lower, and the second switch Q2 becomes on. The first DC power supply terminal 24VIn can supply power to the MCU module 500 through the second switch Q2.

[0047] Reference Figure 1 In some embodiments of the power supply control circuit, the third switch Q3 is a PMOS transistor. The DC load pre-power-on circuit 300 also includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a sixth switch Q6. The second DC power supply terminal 24V-MOT is connected to the source of the third switch Q3 and one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to the gate of the third switch Q3 and one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to one switch pin of the sixth switch Q6. The other switch pin of the sixth switch Q6 is grounded. The output terminal of the MCU module 500 is connected to the control pin of the sixth switch Q6 through the eighth resistor R8.

[0048] In this embodiment, when the sixth switch Q6 is in the off state, the gate-source voltage of the third switch Q3 is relatively large, and the third switch Q3 is also in the off state. The second DC power supply terminal 24V-MOT cannot supply power to the DC load through the third switch Q3 and the second PTC resistor PTC2. When the output terminal of the MCU module 500 triggers the sixth switch Q6 to become the on state, the power supply of the second DC power supply terminal 24V-MOT is grounded through the sixth resistor R6, the seventh resistor R7 and the sixth switch Q6. Under the voltage division effect of the sixth resistor R6 and the seventh resistor R7, the gate-source voltage of the third switch Q3 is lower, and the third switch Q3 becomes the on state. The second DC power supply terminal 24V-MOT can supply power to the DC load through the third switch Q3 and the second PTC resistor PTC2.

[0049] Reference Figure 1 In some embodiments of the power supply control circuit, the fourth switch Q4 is a PMOS transistor. The DC load power supply circuit 400 also includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a seventh switch Q7. The second DC power supply terminal 24V-MOT is connected to the source of the fourth switch Q4 and one end of the ninth resistor R9. The other end of the ninth resistor R9 is connected to the gate of the fourth switch Q4 and one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to one switch pin of the seventh switch Q7. The other switch pin of the seventh switch Q7 is grounded. The output terminal of the MCU module 500 is connected to the control pin of the seventh switch Q7 through the eleventh resistor R11.

[0050] In this embodiment, when the seventh switch Q7 is in the off state, the gate-source voltage of the fourth switch Q4 is relatively large, and the fourth switch Q4 is also in the off state. The second DC power supply terminal 24V-MOT cannot supply power to the DC load through the fourth switch Q4. When the output terminal of the MCU module 500 triggers the seventh switch Q7 to become the on state, the power supply of the second DC power supply terminal 24V-MOT is grounded through the ninth resistor R9, the tenth resistor R10 and the seventh switch Q7. Under the voltage division effect of the ninth resistor R9 and the tenth resistor R10, the gate-source voltage of the fourth switch Q4 is lower, and the fourth switch Q4 becomes the on state. The second DC power supply terminal 24V-MOT can supply power to the DC load through the fourth switch Q4.

[0051] In a second aspect, embodiments of the present invention provide a circuit board including the power supply control circuit as described in the first aspect embodiment above.

[0052] According to the circuit board provided in the embodiment of the present invention, when the pre-power-on trigger terminal 110 of the power supply control circuit obtains the pre-power-on trigger signal, it can trigger the first switch Q1 to conduct through the control pin of the first switch Q1, thereby enabling the first DC power supply terminal 24VIn to supply power to the MCU module 500 through the first switch Q1 and the first PTC resistor PTC1. Due to the current limiting effect of the first PTC resistor PTC1, the charging current of the first capacitor C1 at the moment of power-on can be reduced, avoiding impact on the MCU module 500. Since the first PTC resistor PTC1 consumes electrical energy, it cannot be used for power supply for a long time. After the first capacitor C1 is charged, the second switch Q2 can be controlled to conduct through the output terminal of the MCU module 500, thereby enabling the first DC power supply terminal 24VIn to supply power to the MCU module 500 through the second switch Q2, eliminating the need for power supply from the MCU pre-power-on module 100, and avoiding the problem of input current limitation caused by the temperature rise of the first PTC resistor PTC1. This circuit board can effectively reduce the current at the moment of power-on and improve the reliability of the circuit.

[0053] Thirdly, embodiments of the present invention provide a printer, including the circuit board as described in the second aspect embodiment above.

[0054] According to the printer provided in the embodiment of the present invention, when the pre-power-on trigger terminal 110 of the power supply control circuit obtains the pre-power-on trigger signal, it can trigger the first switch Q1 to conduct through the control pin of the first switch Q1, thereby enabling the first DC power supply terminal 24VIn to supply power to the MCU module 500 through the first switch Q1 and the first PTC resistor PTC1. Due to the current limiting effect of the first PTC resistor PTC1, the charging current of the first capacitor C1 at the moment of power-on can be reduced, avoiding impact on the MCU module 500. Since the first PTC resistor PTC1 consumes electrical energy, it cannot be used for power supply for a long time. After the first capacitor C1 is charged, the second switch Q2 can be controlled to conduct through the output terminal of the MCU module 500, thereby enabling the first DC power supply terminal 24VIn to supply power to the MCU module 500 through the second switch Q2, eliminating the need for power supply from the MCU pre-power-on module 100, and avoiding the problem of input current limitation caused by the temperature rise of the first PTC resistor PTC1. This circuit board can effectively reduce the current at the moment of power-on and improve the reliability of the circuit.

[0055] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A power supply control circuit of a printer, characterized by comprising: The application relates to a power supply control circuit for a printer, which comprises the following parts: an MCU pre-power-on module, which comprises a first PTC resistor, a first switch tube, a first direct-current power supply terminal and a pre-power-on trigger terminal for obtaining a pre-power-on trigger signal, wherein the pre-power-on trigger terminal is connected to a control pin of the first switch tube; one switch pin of the first switch tube is connected to the first direct-current power supply terminal, and the other switch pin is connected to one end of the first PTC resistor, and the other end of the first PTC resistor serves as an output terminal of the MCU pre-power-on module to provide power supply to an MCU module; an MCU formal power supply circuit, which comprises a second switch tube and a first capacitor, wherein the output terminal of the MCU module is connected to a control pin of the second switch tube, one switch pin of the second switch tube is connected to the first direct-current power supply terminal, and the other switch pin of the second switch tube is connected to the output terminal of the MCU pre-power-on module and grounded through the first capacitor; a direct-current load pre-power-on circuit, which comprises a second PTC resistor, a third switch tube and a second direct-current power supply terminal, wherein the MCU module is also connected to a control pin of the third switch tube; one switch pin of the third switch tube is connected to the second direct-current power supply terminal, and the other switch pin is connected to one end of the second PTC resistor, and the other end of the second PTC resistor serves as an output terminal of the direct-current load pre-power-on circuit to provide power supply to a direct-current load; a direct-current load formal power supply circuit, which comprises a fourth switch tube and a second capacitor, wherein the output terminal of the MCU module is also connected to a control pin of the fourth switch tube, one switch pin of the fourth switch tube is connected to the second direct-current power supply terminal, and the other switch pin of the fourth switch tube is connected to the output terminal of the direct-current load pre-power-on circuit and grounded through the second capacitor.

2. The power supply control circuit of claim 1, wherein, The direct-current load pre-power-on circuit further comprises a first flip-flop arranged between the output terminal of the MCU module and the control pin of the third switch tube; the direct-current load formal power supply circuit further comprises a second flip-flop arranged between the output terminal of the MCU module and the control pin of the fourth switch tube; and the power supply control circuit further comprises a printer cover opening signal receiving terminal, which is connected to input terminals of the first flip-flop and the second flip-flop respectively.

3. The power supply control circuit of claim 1, wherein, The first switch tube is a PMOS tube, and the MCU pre-power-on module further comprises a first resistor, a second resistor and a pre-power-on button, wherein the first direct-current power supply terminal is connected to a source of the first switch tube and one end of the first resistor, the first resistor is connected to a gate of the first switch tube and one end of the second resistor, and the other end of the second resistor is grounded through the pre-power-on button.

4. The power supply control circuit of claim 3, wherein, The MCU pre-power-on module further comprises a first diode arranged between the second resistor and the pre-power-on button.

5. The power supply control circuit of claim 1, wherein, The second switch tube is a PMOS tube, the MCU formal power supply circuit further comprises a third resistor, a fourth resistor, a fifth resistor and a fifth switch tube, the first DC power supply end is connected to the source of the second switch tube and one end of the third resistor, the other end of the third resistor is connected to the gate of the second switch tube and one end of the fourth resistor, the other end of the fourth resistor is connected to one switch pin of the fifth switch tube, the other switch pin of the fifth switch tube is grounded, and the output end of the MCU module is connected to the control pin of the fifth switch tube through the fifth resistor.

6. The power supply control circuit of claim 1, wherein, The third switch tube is a PMOS tube, the DC load pre-power-on circuit further comprises a sixth resistor, a seventh resistor, an eighth resistor and a sixth switch tube, the second DC power supply end is connected to the source of the third switch tube and one end of the sixth resistor, the other end of the sixth resistor is connected to the gate of the third switch tube and one end of the seventh resistor, the other end of the seventh resistor is connected to one switch pin of the sixth switch tube, the other switch pin of the sixth switch tube is grounded, and the output end of the MCU module is connected to the control pin of the sixth switch tube through the eighth resistor.

7. The power supply control circuit of claim 1, wherein, The fourth switch tube is a PMOS tube, the DC load formal power supply circuit further comprises a ninth resistor, a tenth resistor, an eleventh resistor and a seventh switch tube, the second DC power supply end is connected to the source of the fourth switch tube and one end of the ninth resistor, the other end of the ninth resistor is connected to the gate of the fourth switch tube and one end of the tenth resistor, the other end of the tenth resistor is connected to one switch pin of the seventh switch tube, the other switch pin of the seventh switch tube is grounded, and the output end of the MCU module is connected to the control pin of the seventh switch tube through the eleventh resistor.

8. A wiring board, characterized by The power supply control circuit comprises any one of claims 1 to 7.

9. A printer characterized by comprising: The circuit board comprises claim 8.

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