CN203119814U - Protection circuit board of branch scissors capable of discharging control by charging end - Google Patents

Abstract

The utility model relates to a protection circuit board of a branch scissors capable of discharging control by a charging end. The protection circuit board is disposed in a casing of the branch scissors, and comprises a handheld control switch, a charging socket, a stretching high-bar control switch, a motor and a control circuit. The stretching high-bar control switch is controlled by the control circuit, the control circuit comprises a lithium battery protection module, a charge-discharge field-effect tube capable of discharging control by the charging end, an RC (resistor capacitor) delay overcurrent unit, a motor control circuit and a charging indication unit, and an independent and separate charge-discharge control unit is controlled by the charge-discharge field-effect tube. The RC delay overcurrent unit is used for time control of charging, discharging and overcurrent delay, and a charge field-effect tube controls the on-off of a motor control field-effect tube in a charging return circuit. A discharge field-effect tube controls a whole output return circuit. The charging end is used for discharging control and charging indication, so that the branch scissors is safer, high-efficient, low in power consumption and high in interference resistance, and is guaranteed to be safer and more reliable during operation.

Description

With the charging end discharge control branch cut the protection circuit plate

Technical field

The utility model relates to a kind ofly cuts the protection circuit plate with the discharge branch of control of charging end, to improve the reliability that branch cuts and the convenience of using control method.

Background technology

In the electronic product, branch is cut and is belonged to a kind of electric clippers, as a kind in the electric tool, is specifically designed to and prunes gardens branch etc.

Electric clippers is made up of motor, reduction box, eccentric shaft-linkage, switch, non rewirable plug and cutter etc.Motor adopts single phase series motor, places in the cabinet, and cabinet is the structural member stator supplementary insulation sometimes that supports motor, constitutes the double insulation structure with the rotor supplementary insulation.Motor drives eccentric shaft-linkage by reduction box, knife bar is driven go up the reciprocating shearing sheet metal of cutter head, and following cutter head is fixed on the knife rest motionless.Power line is the diplocardia sheath soft cable, constitutes non rewirable plug with the twin columns rubber plug.Switch in the safety operation parts of electric clippers.

The branch of pruning gardens branch is cut and is comprised two place's discharge control switches usually, that is: the fuselage that uses when cutting low branch uses when holding discharge control switch and cutting branches of tall trees stretches high bar discharge control switch, this two places discharge control switch all needs to control the action that branch is cut motor, drives blade then and carries out beta pruning.

Design for these two discharge control switches, those skilled in the art expect utilizing seal in physical switch or the microprocessor MCU hand switch of controlling when cutting low branch able to programme in discharge loops, utilize mechanical pulling force effect to make then and stretch high lever switch, but, there is certain limitation in these solutions, namely utilize at discharge loop and seal in the physical switch, need to select ability to cause cost to increase and use for a long time than high-current switch and cause the physical switch internal resistance to increase, reduce the service efficiency of battery; The MCU crash handling, when MCU was subjected to extraneous interference inefficacy, it may send false command, causes the electric clippers misoperation will very likely injure the user; Utilize mechanical pulling force to do and stretch high lever switch, long-term use can occur moving insensitive and two control switchs can be controlled simultaneously, the user is caused problems such as potential safety hazard.

The utility model content

Technical problem to be solved in the utility model is: provide a kind of safer, efficient, low-power consumption, antijamming capability strong cut the protection circuit plate with the discharge branch of control of charging end, it is safer in operating process, more reliable that branch is cut.

The utility model technical problem solves by following technical proposals: with the charging end discharge control branch cut the protection circuit plate with the charging end discharge control branch cut the protection circuit plate, place in the branch shearing machine shell, comprise that fuselage holds control switch KA, charging socket S2, stretch the control circuit of high bar control switch KB and motor D, describedly stretch high bar control switch KB and controlled by control circuit, described control circuit comprises li-ion cell protection IC module, what control was discharged in the charging end discharges and recharges field effect transistor QA/QB, RC time-delay overcurrent unit A, circuit for controlling motor, and charging indicating member C, discharge and recharge control unit B by what discharge and recharge that field effect transistor QA/QB control independently separates, i.e. charging end discharge control unit B is controlled by charging field effect transistor QB and the long-acting QA that should manage of discharge; With RC time-delay overcurrent unit A charge, discharge and overcurrent control time of delay, wherein, the Electric Machine Control field effect transistor QC's in the charging field effect transistor QB control charge circuit is logical and disconnected; Discharge field effect transistor QA controls whole output loop.

On the such scheme basis, described RC time-delay overcurrent unit A holds resistance circuit by divider resistance and RC and forms.

On the such scheme basis, described RC delay circuit is located at the test side of li-ion cell protection IC module, utilizes RC to form delay circuit, realizes the guard delay to charging, discharge and overcurrent.

On the such scheme basis, described discharging and recharging among the control unit B of independently separating, charging signals transfers to switching mode field effect transistor Q1, the drain electrode of field effect transistor Q1 is connected with the grid of power-type field effect transistor Q2, the grid of switching mode field effect transistor Q1 holds resistance circuit with source electrode with a RC and is connected, utilize the logical and disconnected power-type field effect transistor Q2 that controls in the charge circuit of field effect transistor Q1, realize conducting and the shutoff of charge circuit; Discharge signal is transferred to the power-type field effect transistor Q2 in the discharge loop, realizes conducting and the disconnection of discharge loop.

On the such scheme basis, described charging indicating member C is made up of positive-negative-positive triode Qa, NPN type triode Qb, LED light-emitting diode D2, diode D1 and resistance.When charging, D1 forward conduction, battery charge, this moment triode Qa, the Qb conducting, light-emitting diode D2 forward conduction sends ruddiness.After charging finished, diode D1 pressure drop was zero, and diode ends, and Qa ends, and Qb ends, and red light emitting diodes D2 extinguishes.

The operation principle of the utility model charging end charge/discharge control circuit:

(1) when stretching high bar and do not insert fuselage, press control switch KA, by charging end DC-JACK the grid voltage of field effect transistor Q1 is drawn ground, field effect transistor Q1 turn-offs, power-type field effect transistor Q2 conducting in the discharge loop, and motor is started working; After unclamping control switch KA, field effect transistor Q1 opens, and is drawn ground to the grid voltage that makes power-type field effect transistor Q2, and power-type field effect transistor Q2 turn-offs, and motor quits work;

(2) when stretching high bar and insert fuselage, because the crura intermedium of charging end DC-JACK is by unsettled, so no matter control switch KA opens or turn-offs, all can not control discharge system, stretch high lever switch KB if press this moment, field effect transistor Q1 turn-offs, power-type field effect transistor Q2 conducting in the discharge loop, and motor is started working; After pine stretched high lever switch and opens KB, field effect transistor Q1 opened, and power-type field effect transistor Q2 is turn-offed, and discharge finishes, and motor quits work.

Superiority of the present utility model is: discharging with the charging end, control and charging indication make branch cut safer, efficient, low-power consumption, antijamming capability is strong, guarantee that branch cuts safer in operating process, more reliable.

Description of drawings

Fig. 1 is the circuit block diagram of the utility model protection module;

Fig. 2 is charging, discharge, overcurrent, short circuit, delay protection circuit diagram;

Fig. 3 is charging end discharge control protection electric circuit figure;

Fig. 4 is charging indication control circuit figure;

Fig. 5 is the utility model circuit theory diagrams.

Embodiment

Be the circuit block diagram of the utility model protection module as Fig. 1, be charging, discharge, overcurrent, short circuit, delay protection circuit diagram and Fig. 5 are shown in the utility model circuit theory diagrams, with the charging end discharge control branch cut the protection circuit plate, place in the branch shearing machine shell, comprise that fuselage holds control switch KA, charging socket S2, stretch high bar control switch KB, motor D and control circuit, describedly stretch high bar control switch KB and controlled by control circuit, described control circuit comprises li-ion cell protection IC module, what control was discharged in the charging end discharges and recharges field effect transistor QA/QB, RC time-delay overcurrent unit A, circuit for controlling motor, and charging indicating member C, discharge and recharge control unit B by what discharge and recharge that field effect transistor QA/QB control independently separates; With RC time-delay overcurrent unit A charge, discharge and overcurrent control time of delay, wherein, the Electric Machine Control field effect transistor QC's in the charging field effect transistor QB control charge circuit is logical and disconnected; Discharge field effect transistor QA controls whole output loop.

As shown in Figure 2, described charging end discharge control unit B should manage QA control by charging field effect transistor QB with discharge is long-acting.Wherein, the field effect transistor QC in the charging field effect transistor QB control charge circuit is logical and disconnected; Discharge field effect transistor Q A controls whole output loop.

Wherein, overcurrent, short circuit, time-delay control are formed the RC delay circuit by electric resistance partial pressure and electric capacity.

Discharge shown in the control protection electric circuit figure for the charging end as Fig. 3, namely discharge and recharge control unit B for charging end discharge control module in the frame of broken lines, the control unit B charging signals that discharges and recharges that independently separates transfers to switching mode field effect transistor Q1, the drain electrode of field effect transistor Q1 is connected with the grid of power-type field effect transistor Q2, the grid of switching mode field effect transistor Q1 holds resistance circuit with source electrode with a RC and is connected, utilize the logical and disconnected power-type field effect transistor Q2 that controls in the charge circuit of field effect transistor Q1, realize conducting and the shutoff of charge circuit; Discharge signal is transferred to the power-type field effect transistor Q2 in the discharge loop, realizes conducting and the disconnection of discharge loop.The operation principle of charging end charge/discharge control circuit:

(1) namely when stretching high bar and not inserting fuselage, press control switch KA, by charging end DC-JACK the grid voltage of Q1 is drawn ground, field effect transistor Q1 turn-offs, Q2 conducting in the discharge loop, the motor work of starting working; After unclamping KA, Q1 opens, and is drawn ground to the grid voltage that makes Q2, and Q2 turn-offs, and motor quits work;

(2) namely when stretching high bar and insert fuselage, because the crura intermedium of charging end DC-JACK is by unsettled, so no matter KA opens or turn-offs, all can not control discharge system, stretch high lever switch KB, Q1 shutoff if press this moment, Q2 conducting in the discharge loop, motor is started working; After unclamping KB, Q1 opens, and Q2 is turn-offed, and discharge finishes, and motor quits work.

For shown in the charging indication control circuit figure, be the charging indicating module as Fig. 4 in the frame of broken lines, charging indicating member C, described charging indicating member C is made up of positive-negative-positive triode Qa, NPN type triode Qb, LED light-emitting diode D2, diode D1 and resistance.When charging indicating module when charging, D1 forward conduction, battery charge, this moment triode Qa, the Qb conducting, light-emitting diode D2 forward conduction sends ruddiness.After charging finished, diode D1 pressure drop was zero, and diode ends, and Qa ends, and Qb ends, and red light emitting diodes D2 extinguishes.

Claims (5)

1. With the charging end discharge control branch cut the protection circuit plate, place in the branch shearing machine shell, comprise that fuselage holds control switch (KA), charging socket (S2), stretch high bar control switch (KB), motor (D) and control circuit, the described high bar control switch (KB) of stretching is controlled by control circuit, it is characterized in that: described control circuit comprises li-ion cell protection (IC) module, what control was discharged in the charging end discharges and recharges field effect transistor (QA/QB), the RC overcurrent unit (A) of delaying time, circuit for controlling motor, and charging indicating member (C), discharge and recharge control unit (B) by what discharge and recharge that field effect transistor (QA/QB) control independently separates; With RC time-delay overcurrent unit (A) charge, discharge and overcurrent control time of delay, wherein, the Electric Machine Control field effect transistor (QC) in charging field effect transistor (QB) the control charge circuit logical and disconnected; Discharge field effect transistor (QA) is controlled whole output loop.
2. 2. according to claim 1ly cut the protection circuit plate with the discharge branch of control of charging end, it is characterized in that described RC time-delay overcurrent unit (A) holds resistance circuit by divider resistance and RC and forms.
3. According to claim 1 and 2 with the charging end discharge control branch cut the protection circuit plate, it is characterized in that: described discharging and recharging in the control unit (B) of independently separating, charging signals transfers to switching mode field effect transistor (Q1), the drain electrode of field effect transistor (Q1) is connected with the grid of power-type field effect transistor (Q2), the grid of switching mode field effect transistor (Q1) holds resistance circuit with source electrode with a RC and is connected, utilize the logical and disconnected power-type field effect transistor of controlling in the charge circuit (Q2) of field effect transistor (Q1), realize conducting and the shutoff of charge circuit; Discharge signal is transferred to the power-type field effect transistor (Q2) in the discharge loop, realizes conducting and the disconnection of discharge loop.
4. According to claim 1 with the charging end discharge control branch cut the protection circuit plate; it is characterized in that: described RC delay circuit is located at the test side of li-ion cell protection (IC) module; utilize RC to form delay circuit, realize the guard delay to charging, discharge and overcurrent.
5. According to claim 1 with the charging end discharge control branch cut the protection circuit plate, it is characterized in that: described charging indicating member (C) is made up of positive-negative-positive triode (Qa), NPN type triode (Qb), LED light-emitting diode (D2), diode (D1) and resistance.

Images