CN-224218119-U - AC charger control circuit

CN224218119UCN 224218119 UCN224218119 UCN 224218119UCN-224218119-U

Abstract

The utility model relates to an alternating-current charger control circuit which comprises a relay, an MCU module, an AC/DC module, a voltage sampling module and a relay driving control module, wherein the AC/DC module comprises a power frequency transformer, a rectifying unit and a voltage reducing unit, a primary winding of the power frequency transformer is connected with an alternating-current power supply, a secondary winding of the power frequency transformer is connected with an input end of the rectifying unit, an output end of the rectifying unit is connected with an input end of the voltage reducing unit, an output end of the voltage reducing unit provides working voltage for the MCU module, the voltage sampling module and the relay driving control module, a sampling input end of the voltage sampling module is connected with a secondary winding of the power frequency transformer, a voltage feedback output end of the voltage sampling module is connected with the MCU module, and the relay driving control module is connected with the MCU module and the relay and drives the relay to be attracted or disconnected. On the premise of ensuring normal use, the utility model can greatly reduce the product cost and increase the market competitiveness.

Inventors

LIN QIRONG
Yan Shanmao
ZHANG XUEGONG

Assignees

著赫(厦门)新能源技术有限公司

Dates

Publication Date: 20260508
Application Date: 20250325

Claims (10)

1. The alternating-current charger control circuit is characterized by comprising a relay, an MCU module, an AC/DC module, a voltage sampling module and a relay driving control module; the input end of the relay is connected with an alternating current power supply; The AC/DC module comprises a power frequency transformer, a rectifying unit and a voltage reducing unit, wherein a primary winding of the power frequency transformer is connected with an alternating current power supply, a secondary winding of the power frequency transformer is connected with an input end of the rectifying unit, an output end of the rectifying unit is connected with an input end of the voltage reducing unit, and an output end of the voltage reducing unit provides working voltage for the MCU module, the voltage sampling module and the relay driving control module; the sampling input end of the voltage sampling module is connected with the secondary winding of the power frequency transformer, and the voltage feedback output end of the voltage sampling module is connected with the MCU module; The relay driving control module is connected with the MCU module and the relay, and receives an instruction sent by the MCU module and drives the relay to be attracted or disconnected.
2. The AC charger control circuit of claim 1, wherein the secondary winding of the power frequency transformer comprises a first secondary winding and a second secondary winding, the rectifying unit comprises a first rectifying subunit and a second rectifying subunit, the step-down unit comprises a first voltage stabilizer subunit, a second voltage stabilizer subunit and a third voltage stabilizer subunit, the first secondary winding, the first rectifying subunit, the first voltage stabilizer subunit and the second voltage stabilizer subunit are sequentially connected, the first voltage stabilizer subunit outputs +12V voltage, the second voltage stabilizer subunit outputs +5V voltage, the second secondary winding, the second rectifying subunit and the third voltage stabilizer subunit are sequentially connected, and the third voltage stabilizer subunit outputs-12V voltage.
3. The AC charger control circuit as set forth in claim 2, wherein the first rectifier subunit comprises a rectifier bridge DB1 and a resistor R1, the second rectifier subunit comprises a resistor R2 and a diode D1, the first rectifier subunit comprises a voltage regulator U2, a capacitor C1 and a capacitor C3, the second rectifier subunit comprises a voltage regulator U1, a capacitor C2 and a capacitor C4, the third rectifier subunit comprises a voltage regulator U3, a capacitor C5 and a capacitor C6, the first secondary winding NS1 is connected with the input end of the rectifier bridge DB1, the positive electrode output end of the rectifier bridge DB1 is connected with one end of the resistor R1, one end of the capacitor C3 and the input end of the voltage regulator U2, the negative electrode output end of the rectifier bridge DB1, the other end of the resistor R1, the other end of the capacitor C3 and the ground of the voltage regulator U2 are grounded, the output end of the voltage regulator U2 is connected with one end of the capacitor C1 and the input end of the voltage regulator U1, the output end of the output end +12 of the voltage regulator U2 is connected with the output end of the voltage regulator U2 and the output end of the voltage regulator U1 and the output end of the voltage regulator U2C 2 is grounded, the voltage regulator C1 is connected with the other end of the voltage regulator U2 and the output end of the voltage regulator U2 is grounded, the voltage regulator C1 is connected with the other end of the voltage regulator C2 and the output end of the voltage regulator C2 is grounded, and the output end of the voltage regulator C2 is connected with the output end of the voltage regulator C1 is connected with the voltage regulator C1.
4. The AC charger control circuit of claim 2 or 3, further comprising a CP communication module, wherein the CP communication module connects the output of the first voltage regulator subunit and the output of the third voltage regulator subunit for taking power.
5. The AC charger control circuit of claim 1, wherein the voltage sampling module comprises a resistor R4, a resistor R5, a resistor R6, a capacitor C7, a capacitor C8, a capacitor C9, a diode D31, a diode D32 and an operational amplifier U4, one end of the resistor R4 is a sampling input end of the voltage sampling module, the other end of the resistor R4 is connected with the non-inverting input end of the operational amplifier U4, one end of the resistor R6, one end of the capacitor C8, a cathode of the diode D31 and an anode of the diode D32, a cathode of the diode D32 is connected with an output end of the voltage reducing unit, the anode of the diode D31, the other end of the capacitor C8 and the other end of the resistor R6 are grounded, the other end of the resistor R5 is used as a voltage feedback output end of the voltage sampling module, the voltage feedback output end is connected with one end of the capacitor C9, the other end of the capacitor C9 is grounded, a power supply cathode of the operational amplifier U4 is grounded, and the power supply of the operational amplifier U4 is connected with the output end of the voltage reducing unit and the other end of the capacitor C7 is grounded.
6. The AC charger control circuit of claim 1, wherein the relay is a magnetic latching relay having a first coil and a second coil, the relay drive control module comprises a relay off drive unit and a relay on drive unit, the MCU module has a relay on control end and a relay off control end, the relay off drive unit is connected with the relay off control end and the first coil of the magnetic latching relay, the relay off drive unit receives the off command from the relay off control end and drives the magnetic latching relay to be turned off, and the relay on drive unit is connected with the relay on control end and the second coil of the magnetic latching relay, and the relay on drive unit receives the on command from the relay on control end and drives the magnetic latching relay to be turned on.
7. The AC charger control circuit of claim 6, wherein the relay turn-off driving unit comprises a diode D6, a capacitor C12, a resistor R13, a resistor R14, a resistor R18, a resistor R19, a triode Q3, a triode Q4 and a PMOS tube Q1, wherein the anode of the diode D6 is connected with the output end of the voltage dropping unit, the cathode of the diode D6 is connected with one end of the capacitor C12, one end of the resistor R13, one end of the resistor R14 and the source electrode of the PMOS tube Q1, the other end of the capacitor C12 is grounded, the other end of the resistor R14 is connected with the collector electrode of the triode Q4, the base electrode of the triode Q3 and one end of the resistor R18, the base electrode of the triode Q4 is connected with one end of the resistor R19, one end of the resistor R17 and one end of the capacitor C13, and the other end of the resistor R17 are connected with the relay turn-off control end, the other end of the resistor R19, the emitter electrode of the triode Q4 and the emitter electrode of the triode Q3 are grounded; The relay actuation driving unit comprises a resistor R15, a resistor R16 and an NMOS tube Q2, wherein the relay actuation control end is connected with one end of the resistor R16 and the grid electrode of the NMOS tube Q2 through the resistor R15, the other end of the resistor R16 and the drain electrode of the NMOS tube Q2 are grounded, the source electrode of the NMOS tube Q2 is connected with one end of a second coil of the magnetic latching relay, and the other end of the second coil of the magnetic latching relay is connected with the cathode of a diode D6; The first coil of the relay is connected with a diode D5 in parallel, the anode of the diode D5 is grounded, the second coil of the relay is connected with a diode D4 in parallel, and the cathode of the diode D4 is connected with the cathode of a diode D6.
8. The AC charger control circuit of claim 1, further comprising a relay adhesion detection module, wherein the relay adhesion detection module comprises a diode D7, a resistor R20, a resistor R21, a resistor R22, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a capacitor C14 and an optocoupler U5, the output end of the L pole of the relay is connected with the anode of the diode D7, the cathode of the diode D7 is sequentially connected with one end of the resistor R26 and the anode of the light emitter of the optocoupler U5 after passing through the resistor R25, the resistor R20, the resistor R21 and the resistor R22, the other end of the resistor R26 is connected with the cathode of the light emitter of the optocoupler U5 and the N pole of the AC power supply, the collector of the optocoupler U5 is connected with the output end of the voltage reducing unit, the emitter of the light receiver of the optocoupler U5 is connected with one end of the resistor R24, one end of the resistor R27 and one end of the capacitor C14, the other end of the resistor R24 and the other end of the capacitor C14 are grounded, and the other end of the resistor R27 is connected with the MCU for relay adhesion feedback.
9. The AC charger control circuit of claim 1, further comprising an ungrounded detection module, wherein the MCU module is provided with a power input end and an ungrounded feedback receiving end, the ungrounded detection module comprises a resistor R3, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor RD1, a magnetic bead L1, a capacitor C10, a capacitor C11, a capacitor CX1, a diode D21 and a diode D22, the AC power L is connected with one end of the capacitor CX1 and one end of the resistor R12 through the resistor R11, the other end of the resistor R12 is connected with the AC power N pole, the other end of the capacitor CX1 is sequentially connected with one end of the magnetic bead L1 and one end of the capacitor C10 through the resistor R7, the resistor R9, the resistor R8 and the resistor R3, the other end of the magnetic bead L1 is connected with one end of the resistor RD1, one end of the capacitor C11, the anode of the diode D22 and the ungrounded feedback receiving end, the other end of the capacitor C10, the other end of the capacitor C1, the other end of the resistor C11 and the other end of the diode D22 are connected with the power input end of the MCU module.
10. The alternating current charger control circuit according to claim 1, further comprising a current detection module, an indicator light module, a leakage detection module and a temperature detection module, wherein the current detection module is connected with an input end or an output end of the relay to sample current and feed back the current to the MCU module, the indicator light module receives an electric signal of the MCU module to perform light indication, the temperature detection module is connected with the MCU module and feeds back the temperature of the charger, and the leakage detection module is connected with the MCU module and feeds back whether the charger leaks or not.

Description

AC charger control circuit Technical Field The utility model relates to the technical field of alternating-current chargers, in particular to an alternating-current charger control circuit. Background As new energy automobile chargers compete more and more in the market, the charger is more and more functional, such as integrating electricity metering, electricity leakage detection, etc. At present, most of ac chargers on the market are applied to isolating voltage transformers, metering chips, EMC devices and the like, and although the safety, anti-interference characteristics and the like are improved, the cost is also increased greatly, so that the price of products is high, and the market competition is not facilitated. Disclosure of utility model The utility model aims to provide an alternating-current charger control circuit which can greatly reduce the product cost and increase the market competitiveness on the premise of ensuring normal use. In order to achieve the above purpose, the utility model discloses an alternating current charger control circuit, which comprises a relay, an MCU module, an AC/DC module, a voltage sampling module and a relay driving control module; the input end of the relay is connected with an alternating current power supply; The AC/DC module comprises a power frequency transformer, a rectifying unit and a voltage reducing unit, wherein a primary winding of the power frequency transformer is connected with an alternating current power supply, a secondary winding of the power frequency transformer is connected with an input end of the rectifying unit, an output end of the rectifying unit is connected with an input end of the voltage reducing unit, and an output end of the voltage reducing unit provides working voltage for the MCU module, the voltage sampling module and the relay driving control module; the sampling input end of the voltage sampling module is connected with the secondary winding of the power frequency transformer, and the voltage feedback output end of the voltage sampling module is connected with the MCU module; The relay driving control module is connected with the MCU module and the relay, and receives an instruction sent by the MCU module and drives the relay to be attracted or disconnected. Preferably, the secondary winding of the power frequency transformer comprises a first secondary winding and a second secondary winding, the rectifying unit comprises a first rectifying subunit and a second rectifying subunit, the step-down unit comprises a first voltage stabilizer subunit, a second voltage stabilizer subunit and a third voltage stabilizer subunit, the first secondary winding, the first rectifying subunit, the first voltage stabilizer subunit and the second voltage stabilizer subunit are sequentially connected, the first voltage stabilizer subunit outputs +12V voltage, the second voltage stabilizer subunit outputs +5V voltage, the second secondary winding, the second rectifying subunit and the third voltage stabilizer subunit are sequentially connected, and the third voltage stabilizer subunit outputs-12V voltage. Preferably, the first rectifying sub-unit comprises a rectifying bridge DB1 and a resistor R1, the second rectifying sub-unit comprises a resistor R2 and a diode D1, the first rectifying sub-unit comprises a voltage regulator U2, a capacitor C1 and a capacitor C3, the second rectifying sub-unit comprises a voltage regulator U1, a capacitor C2 and a capacitor C4, the third rectifying sub-unit comprises a voltage regulator U3, a capacitor C5 and a capacitor C6, a first secondary winding NS1 is connected with the input end of the rectifying bridge DB1, the positive output end of the rectifying bridge DB1 is connected with one end of the resistor R1, one end of the capacitor C3 and the input end of the voltage regulator U2, the cathode output end of the rectifying bridge DB1, the other end of the resistor R1, the other end of the capacitor C3 and the ground of the voltage regulator U2 are grounded, the output end of the voltage regulator U2 is connected with one end of the capacitor C1, one end of the capacitor C4 and the input end of the capacitor U1, the output end of the voltage regulator U2 outputs +1V voltage, the other end of the capacitor C1 and the other end of the capacitor C4 and the input end of the capacitor C2 are connected with the output end of the voltage regulator U2 through the capacitor C2, the output end of the voltage regulator C2 and the output end of the voltage regulator C2 is grounded, the output end of the voltage regulator C1 is connected with the output end of the voltage regulator C2, and the output end of the voltage regulator C2 is connected with the output end of the voltage regulator C2, and the voltage regulator C1 is grounded. Preferably, the power supply circuit further comprises a CP communication module, wherein the CP communication module is connected with the output end of the first voltage stabilizer subu