Bus discharge control method for power supply fast restart

Abstract

The application discloses a bus discharge control method for power quick restart, which comprises a bus discharge control circuit and operation steps. The bus discharge control circuit comprises a key switch S connected with a power supply, a bus circuit connected with one end of the key switch S, an input enable circuit connected with one end of the switch S, and a semiconductor switch circuit connected with the key switch S and the bus circuit and used for starting a sleep state of a control system. A signal of the input enable circuit is provided by a system MCU. The application has the advantages of simple structure, key switch control power restart, system sleep, no power consumption, input key switch for wake-up, simple application, power supply with an enable function, controllable input on-off of the bus and the power supply, and solution to the problem of quick start caused by integrated bus discharge.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric forklift controller control power supply, in particular to a bus discharge control method for quick restart of power supply. BACKGROUND

[0002] The restart is a function of the electric forklift controller control power supply, when the forklift is not operated for a long time, the controller is required to be in standby sleep state and stop all peripherals to reduce power consumption and keep the vehicle in a safe state, and the control switch key is always closed at this time, and the key switch is disconnected and then closed to wake up, the low-voltage and low-power controller integrates the pre-charging and discharging of the bus into the internal circuit, to avoid excessive circuit to increase the influence on the volume, and the bus is discharged by the power supply. The standby sleep function adopts the power-off control power supply mode, which is safer and lower in power consumption than the control MCU mode, and is woken up by the key switch, which is the same as the power-on process. When there is no bus discharge function, the circuit is defect-free; after the bus discharge function is added, the bus cannot be discharged when waking up because the front power supply has stopped working, which causes the power supply to be unable to start, and only the circuit itself can discharge, which takes a long time, and in application, the forklift cannot be quickly restarted. In the MCU sleep mode, the system control power supply works normally when the peripherals stop working, and the MCU part functions and the power supply are still working, and there is always power consumption. SUMMARY

[0003] In order to solve the above problems in the prior art, the present application provides a bus discharge control circuit in a restart function power supply, which is simple to implement and has no power consumption when the system is powered off.

[0004] The object of the present application is achieved as follows:

[0005] The bus discharge control circuit in the restart function power supply comprises a bus discharge control circuit and operation steps, the bus discharge control circuit comprises a key switch S connected with a power supply, a bus circuit connected with one end of the key switch S, an input enable circuit connected with one end of the switch S, and a semiconductor switch circuit connected with the key switch S and the bus circuit and used for starting the sleep state of the control system, the signal of the input enable circuit is provided by a system MCU, the key switch S is closed, the input enable circuit is powered on to generate an enable signal for a time T, to ensure that the power supply is started and the system is normally operated, when the standby sleep condition is met, the system MCU stops sending the enable signal, the power supply stops working, and the system is powered off and stopped.

[0006] The semiconductor switch circuit comprises a first switch circuit connected with the key switch S and used for controlling the sleep function of the system, and a second switch circuit connected with the first switch circuit and used for disconnecting the bus circuit from the input end of the power supply.

[0007] The first switch circuit includes switch Q1 connected with key switch S and used for controlling system start hibernate function, first drive circuit connected with switch Q1 and used for starting switch Q1, the second switch circuit includes switch Q3 used for controlling bus circuit and power input disconnected, second drive circuit used for starting switch Q3, one end of switch Q3 is connected with output end of switch Q1 through diode D5.

[0008] The first drive circuit includes resistance R5, resistance R6, resistance R7, diode D3 and switch Q2, the second drive circuit includes resistance R9, resistance R10, switch Q5, diode D5 prevents switch Q3 negative voltage damage, MCU bus off is connected with switch Q5 through resistance R11.

[0009] The input enable circuit includes resistance R1, capacitor C1, diode D2 and resistance R2, high level is effective, input enable is generated by resistance R1 and capacitor C1, the condition is that there is voltage difference between two ends of diode D1 when key switch S is closed, power-on generation time T of input enable circuit is determined by resistance R1, capacitor C1 and voltage difference of diode D1, diode D2 and resistance R2 are MCU system enable signal circuit, MCU system enable is connected with input end of diode D2.

[0010] The bus circuit includes bus charging circuit connected with one end of switch key S, bus capacitor connected with bus charging circuit.

[0011] The bus charging circuit includes diode D4 connected with one end of key switch S, resistance R8 connected with output end of diode D4, the other end of resistance R8 is connected with bus capacitor C.

[0012] The operation steps are as follows: step 1: normal starting, the key switch S is closed, the voltage difference of the diode D1 is the battery voltage, the resistor R1 and the capacitor C1 generate a high-level enable signal, the switch Q2 is turned on, the GS voltage of the switch Q1 is established, the switch Q1 is turned on, the power module is powered on to output system working voltage, and the MCU sends an enable signal after running; the process should ensure that the resistor R1 and the capacitor C1 enable time T continues to the MCU sending enable; step 2: in the above step 1, the bus is charged through the diode D4 and the resistor R8, when the MCU detects that the system starting is completed and the state is normal, a high-level control instruction “MCU bus off” is sent, the switch Q5 is turned on, the switch Q3 is turned on, and the bus is connected with the power input circuit; step 3: before standby sleep, the MCU sends a low-level instruction “MCU enable”, the switch Q2 is turned off, the GS voltage of the switch Q1 is discharged through the resistor R5, the switch Q1 enters the off state, the power supply stops outputting, and the whole system stops running, at this time, the key switch S is in the closed state, and the bus voltage remains unchanged due to the conduction of the charging circuit; step 4: the key switch S is opened and then closed to operate the wake-up function, the switch Q3 is in the off state, the diode D1 has a voltage difference, the power supply starts in the same way as in step 1, and the system can wake up; step 5: the shutdown signal generated by the resistor R3 and the resistor R4 is used to distinguish normal shutdown, the key switch S is opened for shutdown, and the “power-on signal” is low level, after the MCU detects, the switch Q3 is always turned on, the bus voltage is consumed through the power supply, and the whole system is powered off and stops running until the power supply input is too low to stop outputting.

[0013] Positive beneficial effects: the application has simple structure, the key switch controls the power restart to realize system sleep, realizes zero power consumption, the input key switch is used for wake-up, application is simple, the power supply has an enable function, the bus and the power input are controllable, and the problem of rapid starting caused by integrated bus discharge is solved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a principle diagram of the application;

[0015] Figure 2 It is a circuit diagram of the application. DETAILED DESCRIPTION

[0016] The application is further described below in combination with the drawings and embodiments.

[0017] As Figure 1 and Figure 2As shown, the bus discharge control circuit in the restart function power supply includes a bus discharge control circuit and operation steps, the bus discharge control circuit includes a key switch S connected with the power supply, a bus circuit connected with one end of the key switch S, an input enable circuit connected with one end of the switch S, a semiconductor switch circuit connected with the key switch S and the bus circuit and used for starting the sleep state of the control system, S is a key, the access of the control battery, R3 and R4 are switch-on signal detection, the signal of the input enable circuit is provided by the system MCU, the key switch S is closed, the input enable circuit is powered on to generate an enable signal for a time T, the power supply is ensured to start, the system is normally operated, when the standby sleep condition is met, the system MCU stops sending the enable signal, the power supply stops working, the system is powered off and stops operating, the system can be powered off without generating power consumption, the input key switch is used for waking up, the application has obvious advantages, is simple and easy to implement, and the product is in a safer state after the system is powered off.

[0018] The semiconductor switch circuit includes a first switch circuit connected with the key switch S and used for controlling the system to start the sleep function, and a second switch circuit connected with the first switch circuit and used for controlling the bus circuit to be disconnected from the power supply input end. The first switch circuit includes a switch Q1 connected with the key switch S and used for controlling the system to start the sleep function, and a first drive circuit connected with the switch Q1 and used for starting the switch Q1, and the second switch circuit includes a switch Q3 used for controlling the bus circuit to be disconnected from the power supply input end, and a second drive circuit used for starting the switch Q3, one end of the switch Q3 is connected with the output end of the switch Q1 through a diode D5, the first drive circuit includes a resistor R5, a resistor R6, a resistor R7, a diode D3 and a switch Q2, and the second drive circuit includes a resistor R9, a resistor R10 and a switch Q5, and the diode D5 prevents the switch Q3 from being damaged by negative voltage, and the MCU bus off is connected with the switch Q5 through a resistor R11.

[0019] The input enable circuit includes a resistor R1, a capacitor C1, a diode D2 and a resistor R2, is high-level effective, and input enable is generated by the resistor R1 and the capacitor C1, the condition is that there is a voltage difference between two ends of the diode D1 when the key switch S is closed, the time T of power-on of the input enable circuit is determined by the resistor R1, the capacitor C1 and the voltage difference of the diode D1, the diode D2 and the resistor R2 are an MCU system enable signal circuit, and the MCU system enable is connected with the input end of the diode D2.

[0020] The bus circuit includes a bus charging circuit connected with one end of the switch key S and a bus capacitor connected with the bus charging circuit. The bus charging circuit includes a diode D4 connected with one end of the key switch S and a resistor R8 connected with the output end of the diode D4, and the other end of the resistor R8 is connected with the bus capacitor C.

[0021] The operation steps are as follows: step 1: normal starting, the key switch S is closed, the voltage difference of the diode D1 is the battery voltage, the resistor R1 and the capacitor C1 generate a high level of enable signal, the switch Q2 is turned on, the GS voltage of the switch Q1 is established, the switch Q1 is turned on, the power module is powered on to output system working voltage, the MCU sends an enable signal after running, and the process should ensure that the resistor R1 and the capacitor C1 enable time T continues to the MCU sending enable.

[0022] Step 2: In the above step 1, the bus is charged through the diode D4 and the resistor R8, when the MCU detects that the system starting is completed and the state is normal, a high level control instruction "MCU bus off" is sent, the switch Q5 is turned on, the switch Q3 is turned on, and the bus is connected with the power input circuit.

[0023] Step 3: Before standby sleep, the MCU sends a low level instruction "MCU bus off", the switch Q5 is turned off, the switch Q3 is turned off, the bus is disconnected with the power input circuit, standby sleep is executed, the MCU sends a low level instruction "MCU enable", the switch Q2 is turned off, the GS voltage of the switch Q1 is discharged through the resistor R5, the switch Q1 enters the off state, the power is turned off to stop output, and the whole system stops running, at this time, the key switch S is in a closed state, and the bus voltage is maintained unchanged due to the conduction of the charging circuit.

[0024] Step 4: The key switch S is turned off and then turned on to operate the wake-up function, the switch Q3 is in an off state, the voltage difference of the diode D1 exists, the power is started in the same way as step 1, and the system can be woken up.

[0025] Step 5: The shutdown signal generated by the resistor R3 and the resistor R4 is to distinguish normal shutdown, the key switch S is turned off for shutdown, and the "power on signal" is in a low level, after the MCU detects, the switch Q3 is kept on, the bus voltage is consumed through the power, until the power input is too low to stop output, and the whole system is powered off to stop running.

[0026] The application has the advantages that the structure is simple, the key switch controls the power restart to realize system sleep, realizes zero power consumption, the input key switch is used for wake-up, the application is simple, the power has an enable function, the bus and the power input are controllable, and the problem of rapid starting caused by integrated bus discharge is solved.

Claims

1. A method of bus discharge control for fast power restart, characterized by: The bus discharge control circuit and operation steps, the bus discharge control circuit includes key switch S connected with power supply, bus circuit connected with one end of key switch S, input enable circuit connected with one end of switch S, semiconductor switch circuit connected with key switch S and bus circuit and used for starting sleep state of control system, signal of input enable circuit is provided by system MCU, key switch S is closed, input enable circuit is powered to generate enable of time T, power supply is started to ensure normal operation of system, when standby sleep condition is met, system MCU stops sending enable signal, power supply stops working, system power down and stops running; The semiconductor switch circuit includes first switch circuit connected with key switch S and used for controlling system start sleep function, second switch circuit connected with first switch circuit and used for controlling disconnection of bus circuit and input end of first switch circuit; The first switch circuit includes switch Q1 connected with key switch S and used for controlling system start sleep function, first drive circuit connected with switch Q1 and used for starting switch Q1, the second switch circuit includes switch Q3 used for controlling disconnection of bus circuit and input end of first switch circuit, and second drive circuit used for starting switch Q3; one end of switch Q3 is connected with input end of switch Q1 through diode D5; key switch S is connected with switch Q1 through diode D1; The first drive circuit includes resistor R5, resistor R6, resistor R7, diode D3 and switch Q2, the second drive circuit includes resistor R9, resistor R10 and switch Q5, diode D5 prevents switch Q3 from being damaged by negative voltage, and MCU bus off signal is connected with switch Q5 through resistor R11.

2. The bus discharge control method for power quick restart according to claim 1, characterized by: The input enable circuit includes resistor R1, capacitor C1, diode D2 and resistor R2, high level is effective, input enable is generated by resistor R1 and capacitor C1, and the condition is that there is voltage difference between two ends of diode D1 when key switch S is closed, time T generated by resistor R1, capacitor C1 and diode D1 voltage difference is powered on input enable circuit, diode D2 and resistor R2 are MCU system enable signal circuit, and MCU system enable signal is connected with input end of diode D2.

3. The bus discharge control method for power quick restart according to claim 2, characterized by: The bus circuit includes bus charging circuit connected with one end of switch key S and bus capacitor connected with bus charging circuit.

4. The power quick restart bus discharge control method of claim 3, wherein: The bus charging circuit includes diode D4 connected with one end of key switch S, and resistor R8 connected with output end of diode D4, and the other end of resistor R8 is connected with bus capacitor C.

5. The power quick restart bus discharge control method of claim 4, wherein, The operation steps are: step 1: normal start, the key switch S is closed, the diode D1 has a voltage difference, the resistor R1 and the capacitor C1 generate a high-level enable signal, the switch Q2 is turned on, the GS voltage of the switch Q1 is established, the switch Q1 is turned on, the power module is powered on to output the system working voltage, the MCU sends an enable signal after running, and the process should ensure that the resistor R1 and the capacitor C1 enable time T continues until the MCU sends the enable signal; step 2: in the above step 1, the bus is charged through the diode D4 and the resistor R8, when the MCU detects that the system startup is completed and the state is normal, a high-level control instruction MCU bus off signal is sent, the switch Q5 is turned on, the switch Q3 is turned on, and the bus is connected with the power input circuit; step 3: before standby sleep, the MCU sends a low-level instruction MCU bus off signal, the switch Q5 is turned off, the switch Q3 is turned off, and the bus is disconnected with the power input circuit; the standby sleep is executed, the MCU sends a low-level instruction MCU system enable signal, the switch Q2 is turned off, the GS voltage of the switch Q1 is discharged through the resistor R5, the switch Q1 enters the off state, the power supply stops outputting, and the whole system stops running, at this time, the key switch S is in a closed state, and the bus voltage remains unchanged due to the conduction of the charging circuit; Step 4: the key switch S is turned off and then turned on to operate the wake-up function, the switch Q3 is in an off state, the diode D1 has a voltage difference, the power supply starts in the same way as step 1, and the system can wake up; step 5: the shutdown signal generated by the resistor R3 and the resistor R4 is to distinguish normal shutdown, the key switch S is turned off for shutdown, and the "power-on signal” is in a low level; after the MCU detects, the switch Q3 is always turned on, the bus voltage is consumed through the power supply, and the whole system is powered off and stops running until the power supply input is too low to stop outputting.

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