Lithium battery alternating current activation control device for motor home

Abstract

The utility model discloses a lithium battery alternating current activation control device for a motor home, which is characterized in that an alternating current input end of a rectifier bridge is used for being connected with commercial power, an output end positive electrode of the rectifier bridge is connected with a first end of a primary winding of a transformer T1, and a second end of the primary winding of the transformer T1 is connected with an output end of a power supply main control chip U1; a first end of a secondary winding of the transformer T1 is connected to a battery end positive electrode PACK +, a second end of the secondary winding of the transformer T1 is connected to a battery end negative electrode PACK-, a control end positive electrode of the optical coupler U2 is connected to the battery end positive electrode PACK +, a control end negative electrode of the optical coupler U2 is connected to a first switch end of the switch tube Q1, a second switch end of the switch tube Q1 is grounded, and a control end of the switch tube Q1 is used for accessing an MCU signal. And two switch ends of the optocoupler U2 are respectively connected with a power supply end VCC and a feedback control end FB of the power supply main control chip U1. According to the utility model, the use efficiency of the auxiliary power supply can be improved, the circuit structure can be simplified and the circuit reliability can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a house car battery control circuit especially relates to a lithium battery AC activation control device for house car. BACKGROUND

[0002] In the BMS hibernation process of the lithium battery in the traditional house car bidirectional inverter power supply design, the battery end has no output voltage, therefore the design of the auxiliary control power supply must take into account the battery with power and without power, and the grid end also takes into account the power and without power, for this, the usual practice is to design two sets of auxiliary power supply with the same power: DC power supply auxiliary power supply, AC power supply auxiliary power supply, this circuit is more complex, and the application cost is high.

[0003] In the prior art, when the inverter is running, the power source of the auxiliary power supply at the AC end is: the DC at the battery end is boosted into high-voltage AC power supply through the inverter, and then output to the low-voltage battery side through the rectifier and high-voltage flyback circuit for auxiliary control, and the two auxiliary power supplies work at the same time, the load distribution of the auxiliary power supply is light, the efficiency of the two auxiliary power supplies is also low, and the loss is high, and for the application scene of the house car using the battery for a long time, the use efficiency of the other AC auxiliary power supply is low. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model lies in that, in view of the defects of the prior art, a lithium battery AC activation control device for house car is provided, which can improve the use efficiency of the auxiliary power supply, simplify the circuit structure and improve the reliability of the circuit.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme.

[0006] A lithium battery AC activation control device for house car, which comprises a rectifier bridge, a power supply main control chip U1, a transformer T1, an optical coupler U2 and a switching tube Q1, the AC input end of the rectifier bridge is used for connecting the mains, the output end positive pole of the rectifier bridge is connected to the first end of the primary winding of the transformer T1, the second end of the primary winding of the transformer T1 is connected to the output end of the power supply main control chip U1, the first end of the secondary winding of the transformer T1 is connected to the positive pole PACK+ of the battery end, the second end of the secondary winding of the transformer T1 is connected to the negative pole PACK- of the battery end, the power supply end VCC of the power supply main control chip U1 is connected to the positive pole PACK+ of the battery end, the control end anode of the optical coupler U2 is connected to the positive pole PACK+ of the battery end, the control end cathode of the optical coupler U2 is connected to the first switching end of the switching tube Q1, the second switching end of the switching tube Q1 is grounded, the control end of the switching tube Q1 is used for inputting the MCU signal, and the two switching ends of the optical coupler U2 are connected to the power supply end VCC and the feedback control end FB of the power supply main control chip U1 respectively.

[0007] Preferably, the switch tube Q1 is an N-channel MOS tube, the drain of the switch tube Q1 is the first switch end, the source of the switch tube Q1 is the second switch end, and the gate of the switch tube Q1 is the control end.

[0008] Preferably, a filter capacitor C1 is connected between the positive output end and the negative output end of the rectifier bridge.

[0009] Preferably, a capacitor C2, a resistor R1 and a diode D6 are included, the first end of the capacitor C2 and the resistor R1 connected in parallel is connected to the positive output end of the rectifier bridge, the second end of the capacitor C2 and the resistor R1 connected in parallel is connected to the cathode of the diode D6, and the anode of the diode D6 is connected to the second end of the primary winding of the transformer T1.

[0010] Preferably, a diode D5 is arranged between the first end of the secondary winding of the transformer T1 and the positive battery end PACK+, the anode of the diode D5 is connected to the first end of the secondary winding of the transformer T1, and the cathode of the diode D5 is connected to the positive battery end PACK+.

[0011] Preferably, a stabilizing tube D7 is included, the anode of the stabilizing tube D7 is connected to the negative battery end PACK-, and the cathode of the stabilizing tube D7 is connected to the first switch end of the switch tube Q1.

[0012] Preferably, a resistor R3 is connected in series between the anode of the control end of the optocoupler U2 and the positive battery end PACK+.

[0013] In the lithium battery AC activation control device, the utility model discloses a rectifier bridge is composed of diode D1, diode D2, diode D3 and diode D4, and the AC power supply is rectified into DC voltage and provided for the primary winding of the transformer T1, simultaneously, the power supply master control chip U1, the transformer T1, the optocoupler U2 and the starting resistor R2 constitute the flyback power supply of wide voltage output, thereby outputting the voltage required for activating the lithium battery pack, outputting the DC voltage when the battery is activated, and the DC auxiliary power supply of the inverter normally works, and if the battery voltage is normal, the preset MCU detects the high level control switch tube Q1 and turns on, the optocoupler U2 turns on, the power supply master control chip U1 is closed, thereby closing the activation circuit, and the lithium battery normally outputs, based on the above principle, compared with the prior art, the utility model can improve the auxiliary power supply use efficiency, can simplify the circuit structure and can improve the circuit reliability. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the lithium battery AC activation control device schematic diagram of the utility model.

[0015] Figure 2 The control flow chart when the battery voltage changes. DETAILED DESCRIPTION

[0016] The utility model will be described in more detail below in combination with the drawings and examples.

[0017] The utility model discloses a lithium battery AC activation control device for motor home, please see Figure 1 It includes rectifier bridge 1, power main control chip U1, transformer T1, photoelectric coupler U2 and switch tube Q1, the AC input of rectifier bridge 1 is used to connect commercial power, the output positive pole of rectifier bridge 1 is connected to the first end of transformer T1 primary winding, the second end of transformer T1 primary winding is connected to the output of power main control chip U1, the first end of transformer T1 secondary winding is connected to battery end positive pole PACK+, the second end of transformer T1 secondary winding is connected to battery end negative pole PACK-, the power end VCC of power main control chip U1 is connected to battery end positive pole PACK+, the control end anode of photoelectric coupler U2 is connected to battery end positive pole PACK+, the control end cathode of photoelectric coupler U2 is connected to the first switch end of switch tube Q1, the second switch end of switch tube Q1 is grounded, the control end of switch tube Q1 is used to input MCU signal, and the two switch ends of photoelectric coupler U2 are connected to the power end VCC and feedback control end FB of power main control chip U1 respectively.

[0018] In the above circuit, commercial power input AC is to the rectifier bridge 1 that is composed of diode D1, diode D2, diode D3, diode D4, and the AC commercial power is rectified into DC voltage and then provided to the primary winding of transformer T1, at the same time, power main control chip U1, transformer T1, photoelectric coupler U2 and starting resistor R2 constitute a flyback power supply with wide voltage output, so as to output the voltage required for activating lithium battery pack, and output DC voltage after the battery is activated, and the DC auxiliary power supply of inverter works normally, and if the battery voltage is normal, the preset MCU detects high level control switch tube Q1 and turns on, photoelectric coupler U2 is turned on, power main control chip U1 is turned off, so as to turn off the activation circuit, and lithium battery normally outputs, based on the above principle, compared with the prior art, the utility model can improve the use efficiency of auxiliary power supply, can simplify the circuit structure and can improve the circuit reliability.

[0019] Please see Figure 1In the embodiment, the switch tube Q1 is an N-channel MOS tube, the drain of the switch tube Q1 is used as the first switch end, the source of the switch tube Q1 is used as the second switch end, and the gate of the switch tube Q1 is used as the control end.

[0020] In order to stabilize the DC side voltage, in the embodiment, the filter capacitor C1 is connected between the positive output end and the negative output end of the rectifier bridge 1.

[0021] As a preferred mode, please refer to Figure 1 In the embodiment, the capacitor C2, the resistor R1 and the diode D6 are included, the first end of the parallel connection of the capacitor C2 and the resistor R1 is connected to the positive output end of the rectifier bridge 1, the second end of the parallel connection of the capacitor C2 and the resistor R1 is connected to the cathode of the diode D6, and the anode of the diode D6 is connected to the second end of the primary winding of the transformer T1. In the above circuit, the diode D6, the resistor R1 and the capacitor C2 form a leakage inductance spike absorption circuit for absorbing the leakage inductance spike voltage.

[0022] In order to suppress the reverse current, in the embodiment, the diode D5 is arranged between the first end of the secondary winding of the transformer T1 and the positive battery end PACK+, the anode of the diode D5 is connected to the first end of the secondary winding of the transformer T1, and the cathode of the diode D5 is connected to the positive battery end PACK+.

[0023] As a preferred mode, please refer to Figure 1 In the embodiment, the voltage stabilizing tube D7 is included, the anode of the voltage stabilizing tube D7 is connected to the negative battery end PACK-, and the cathode of the voltage stabilizing tube D7 is connected to the first switch end of the switch tube Q1. In the embodiment, the flyback power supply with wide voltage output is composed of the master control chip, the transformer T1, the optocoupler U2, the starting resistor R2 and the voltage stabilizing diode D7, and the voltage required for activating the lithium battery string is output by using the flyback power supply.

[0024] As a preferred mode, the resistor R3 is connected in series between the control end anode of the optocoupler U2 and the positive battery end PACK+.

[0025] The lithium battery AC activation control device for a motor home disclosed in the utility model solves the problem of low utilization rate of another AC auxiliary power supply in the application scenario of long-time use of the battery of the motor home. Based on the above technical scheme, combined with Figure 2As shown, the utility model discloses a little power AC activation circuit replaces traditional high -voltage auxiliary power, not only power is small, and the capacitance of circuit, diode, transformer etc. demand is less, and cost is lower, moreover, the BMS activation circuit principle of lithium ion battery, at battery BMS output PACK end, exert an about 80% above battery voltage, BMS will activate at this time, and lithium battery PACK opens output switch, simultaneously, the current required for circuit to satisfy BMS activation is small, and after the activation of lithium battery, the DC auxiliary power of bidirectional inverter works, and the control signal of MCU output is closed, and the activation circuit is closed, in addition, the power grid end and battery end of the utility model better satisfy the demand of safety isolation of regulation.

[0026] The above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, and the modification, equivalent replacement or improvement etc. that is made in the technical range of the utility model should be contained in the range of protection of the utility model.

Claims

1. A lithium battery AC activation control device for RVs, characterized in that, The device includes a rectifier bridge (1), a power control chip U1, a transformer T1, an optocoupler U2, and a switching transistor Q1. The AC input terminal of the rectifier bridge (1) is used to connect to the mains power. The positive terminal of the output terminal of the rectifier bridge (1) is connected to the first terminal of the primary winding of the transformer T1. The second terminal of the primary winding of the transformer T1 is connected to the output terminal of the power control chip U1. The first terminal of the secondary winding of the transformer T1 is connected to the positive terminal PACK+ of the battery. The second terminal of the secondary winding of the transformer T1 is connected to the negative terminal PACK- of the battery. The power supply terminal VCC of the power control chip U1 is connected to the positive terminal PACK+ of the battery. The anode of the control terminal of the optocoupler U2 is connected to the positive terminal PACK+ of the battery. The cathode of the control terminal of the optocoupler U2 is connected to the first switching terminal of the switching transistor Q1. The second switching terminal of the switching transistor Q1 is grounded. The control terminal of the switching transistor Q1 is used to connect to the MCU signal. The two switching terminals of the optocoupler U2 are respectively connected to the power supply terminal VCC and the feedback control terminal FB of the power control chip U1.

2. The lithium battery AC activation control device for RVs as described in claim 1, characterized in that, The switching transistor Q1 is an N-channel MOS transistor. The drain of the switching transistor Q1 serves as the first switching terminal, the source of the switching transistor Q1 serves as the second switching terminal, and the gate of the switching transistor Q1 serves as the control terminal.

3. The lithium battery AC activation control device for RVs as described in claim 1, characterized in that, A filter capacitor C1 is connected between the positive and negative output terminals of the rectifier bridge (1).

4. The lithium battery AC activation control device for RVs as described in claim 1, characterized in that, The rectifier includes a capacitor C2, a resistor R1, and a diode D6. The first end of the parallel connection of the capacitor C2 and the resistor R1 is connected to the positive terminal of the output of the rectifier bridge (1). The second end of the parallel connection of the capacitor C2 and the resistor R1 is connected to the cathode of the diode D6. The anode of the diode D6 is connected to the second end of the primary winding of the transformer T1.

5. The lithium battery AC activation control device for RVs as described in claim 1, characterized in that, A diode D5 is provided between the first end of the secondary winding of the transformer T1 and the positive terminal PACK+ of the battery. The anode of the diode D5 is connected to the first end of the secondary winding of the transformer T1, and the cathode of the diode D5 is connected to the positive terminal PACK+ of the battery.

6. The lithium battery AC activation control device for RVs as described in claim 1, characterized in that, It includes a Zener diode D7, the anode of which is connected to the negative terminal PACK- of the battery, and the cathode of which is connected to the first switching terminal of the switching transistor Q1.

7. The lithium battery AC activation control device for RVs as described in claim 1, characterized in that, A resistor R3 is connected in series on the line between the control terminal anode of the optocoupler U2 and the positive terminal PACK+ of the battery.

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