Delay switching circuit for inhibiting electrifying pulse current
A delay switch and electric pulse technology, applied in the field of delay switch circuit, can solve the problems of insignificant inhibition of large pulse current, loss of serial current sampling resistors, melting of battery pole pieces, etc., achieve current limiting in a timely and effective manner, and eliminate contact Hidden dangers of ignition and the effect of avoiding sparks
Active Publication Date: 2014-02-12
HYTERA COMM CORP
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Problems solved by technology
[0003] The large pulse current at the moment of power-on will bring two problems: one is that when the contact of the battery pole piece is unstable, these large pulse currents will generate high heat at the contact part of the battery pole piece, and the battery will be damaged. Partial melting of pole piece
Second, the pulsed large current generated by instantaneous charging will bring strong electromagnetic interference to the surrounding space.
[0008] Since the current needs to be collected in this circuit, then converted into a sampling voltage, and then the first switching tube is controlled through the sampling voltage, there is a delay in the current feedback control process, and the suppression effect on the sudden large pulse current generated when the power is turned on is not obvious, and Connecting the current sampling resistor in series in the main power supply circuit will cause loss, thereby reducing the utilization efficiency of the battery
Method used
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Embodiment Construction
[0047] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0048] see figure 2 , which is a structural diagram of Embodiment 1 of a delay switch circuit for suppressing power-on pulse current provided by the present invention.
[0049] The delay switching circuit for suppressing the power-on pulse current provided in this embodiment includes: a first switching tube Q1, a second switching tube Q2, a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2;
[0050] The first end of the first switching tube Q1 is connected to the positive pole B+1 of the battery, and the second end is connected to the positive pole VB+ of the main circuit 100 of the handheld device;
[0051] A first capacitor C1 is connected between the first terminal and the third terminal of t...
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The invention provides a delay switching circuit for inhibiting electrifying pulse current. The delay switching circuit delays the breakover of a second switching tube through a switch delay time timing network which consists of a second resistor and a second capacitor; and when the second switching tube is switched on, a first capacitor is charged, then a first switching tube is switched on, and a battery starts to supply electricity to a main circuit. The first switching tube is connected to a main power supply loop to serve as a delay switch; when power is on, the delay switch delays a certain period of time, and then connects a power supply with the main power supply loop; the switch on of the delay switch takes variable resistance transition time from big resistance to small resistance; and the instant electrifying pulse current is effectively inhibited in time by double action of delay and variable resistance switch on, so that the aims of eliminating striking fire of battery pole pieces and reducing the electromagnetic interference of instant electrifying are fulfilled.
Description
technical field [0001] The invention relates to the technical field of switch circuits, in particular to a delay switch circuit for suppressing power-on pulse current. Background technique [0002] The power supply circuit of handheld devices generally has capacitors with a certain capacity. At the moment of power-on, the power supply will charge these capacitors, thereby generating a large pulse current. [0003] The large pulse current at the moment of power-on will bring two problems: one is that when the contact of the battery pole piece is unstable, these large pulse currents will generate high heat at the contact part of the battery pole piece, and the battery will be damaged. Pole piece is partially melted. At the same time, the air around the molten battery pole piece expands rapidly to produce an explosion, and the explosive airflow brings the molten metal liquid to the surrounding air, causing sparks to splash. The second is that the pulsed high current generated...
Claims
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IPC IPC(8): H03K17/28
Inventor 潘启辉熊运远卢良飞冯超
Owner HYTERA COMM CORP