Printer pre-charging circuit
A pre-charging circuit and printer technology, which is applied to circuit devices, electrical components, emergency power arrangements, etc., can solve problems such as failure to start the machine, low output voltage of the DC/DC module, etc., and achieve the effect of avoiding failure to start the machine
Inactive Publication Date: 2011-12-14
SHENZHEN CHUANGZHICHENG TECH CO LTD
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Problems solved by technology
[0003] Since the printer module needs to meet the requirements of the motor for instantaneous high current, a large capacitor is placed at the 5V input of the printer module motor, but this will cause the large capacitor to be charged instantaneously when starting up, and the main board DC / DC that provides 5V to the printer The output voltage of the module is pulled down, which leads to the undervoltage protection of the DC / DC module and cannot be turned on
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[0008] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0009] The printer pre-charging circuit of the embodiment of the present invention is used to pre-charge the portable printer. The portable printer is built in a notebook computer.
[0010] See figure 1 The printer pre-charging circuit of the embodiment of the present invention includes a first field effect transistor Q1, a second field effect transistor Q3, a third field effect transistor Q5, a first transistor Q2, and a second transistor Q4.
[0011] The gate of the first field effect transistor Q1 is connected to the switch signal terminal 10, the source of the transistor Q1 is grounded, and...
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The invention belongs to the field of printers. Disclosed is a printer precharging circuit, in which the gate of a first field effect transistor is connected to a switch signal terminal, the source is grounded, and the drain is connected to the base of the first triode. The emitter of the first triode is connected to the first DC input power supply, and the collector is connected in series with the first resistor. The first resistor is connected to the output end of the power supply. The drain of the second field effect transistor is connected to the first direct current input power supply, and the source is connected to the output terminal of the power supply. The gate of the third field effect transistor is sequentially connected in series with the second resistor and the switch signal terminal, the source is grounded, and the drain is connected to the base of the second triode. The first capacitor is connected between the gate and the source of the third field effect transistor. The emitter of the second triode is connected to the second direct current power supply, and the collector is connected to a node between the source of the second field effect transistor and the output end of the above-mentioned power supply. The gate of the second field effect transistor is connected to the collector of the second triode, and then grounded. The invention can prevent the printer from being unable to start due to too low voltage.
Description
Technical field [0001] The invention belongs to the field of printers, and particularly relates to a printer pre-charging circuit. Background technique [0002] The current portable printing methods are mainly as follows: (1) a laptop computer with an external printer module; (2) a laptop computer with a built-in printer module. [0003] Because the printer module needs to meet the motor's requirements for instantaneous high current, a large capacitor is placed at the 5V input of the printer module motor, but this will cause the large capacitor to be instantly charged when turning on the printer, and the 5V is provided to the printer's motherboard DC / DC The output voltage of the module is pulled down, causing the DC / DC module to be under-voltage protection and unable to boot. Summary of the invention [0004] The purpose of the present invention is to provide a printer pre-charging circuit, which can pre-charge the printer, so that when the printer is turned on, the voltage is too ...
Claims
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IPC IPC(8): H02J9/06
Inventor 洪育华汪励
Owner SHENZHEN CHUANGZHICHENG TECH CO LTD