CN201219239Y - A starting power supply with low power input and high power output - Google Patents

Abstract

The utility model discloses a start electrical source with low power input and high power output, which is object to resolve the starting up of field high power starting motor, specifically reliable starting up under low-temperature, and to resolve the defect of the prior vehicle-mounted accumulator starting up. The three-phase alternating current is connected to the input terminal of a full-bridge topology circuit through an AC-DC converter, the output of the full-bridge topology is connected to two taps of the primary coil of a transformer; the two taps of the primary coil of the transformer respectively thrill through a saturated magnetic bead, and then connect in series with an absorbent circuit composed by connecting a RC circuit and a diode in parallel, and then the two tap circuits are in mutual parallel connection; the parallel circuit is then connected in series with a filtering reactance, then connected to the anode of the output energy storage capacitor, and the cathode of the output energy storage capacitor is connected to the intermediate tap of the secondary coil of the transformer. The utility model has advantages of unrestricted starting number, large charge and discharge current, short charge and discharge time, low starting up temperature and maintenance free.

Description

A starting power supply with low power input and high power output

technical field

The utility model relates to the field of inverter power supplies, in particular to a starting power supply with small power input and high power output.

Background technique

Because there is no commercial power in the field, the output power of the mobile generator is limited, and the peak power of the starter motor has to reach 90KW to start. The traditional method is to start with the on-board battery. It can be started at normal temperature, but the battery will be exhausted after several starts, and the battery needs to be replenished, and the charging time of the battery is long; If the performance of the storage battery is severely degraded, it cannot be used for starting. In this case, there is a design of starting power supply with low power input and high power output.

Utility model content

The purpose of this utility model is to provide a starting power supply with small power input and high power output, the main purpose is to solve the starting of high-power starter motors in the field, especially the reliable starting at low temperature, and solve the shortcomings of the current vehicle battery starting.

The technical scheme of the utility model is as follows:

A starting power supply with low power input and high power output, characterized in that after the three-phase AC passes through the AC-DC converter, the two ends of the output DC circuit are connected in parallel with a filter and energy storage circuit composed of resistors and capacitors, and then connected to four The input end of the full-bridge topology circuit composed of IGBT modules Q1, Q2, Q3, and Q4. The G pole and E pole of each IGBT tube are connected to the control drive circuit, and the control drive circuit controls the switch of each IGBT. The full-bridge topology circuit A resonant capacitor is connected in parallel on the bridge arm; a tap of the primary coil of the transformer is connected to the E pole of the IGBT module Q3 of the full-bridge topology circuit and the C pole of the IGBT module Q4 through a protection circuit composed of a current transformer, a DC blocking capacitor, and a saturated inductance. Between poles, the other tap of the primary coil of the transformer is connected between the E pole of the IGBT module Q1 and the C pole of the IGBT module Q2 of the full bridge topology circuit; the taps at both ends of the secondary coil of the transformer pass through the saturated magnetic beads respectively After connecting in series, an absorption circuit composed of RC circuit and diode in parallel is connected in parallel with each other; after parallel connection, a filter reactance is connected in series, connected to the positive pole of the output energy storage capacitor, and the negative pole of the output energy storage capacitor is connected to the middle of the secondary coil of the transformer on tap

The working principle of the utility model is as follows:

Three-phase 380V AC is rectified and filtered to generate 532V DC voltage, which is then converted into high-frequency AC voltage through IGBT module and high-frequency transformer, and then 48V/24V DC voltage is generated through secondary rectification and filtering.

The technical characteristics of the utility model are as follows:

The super farad capacitor is selected in parallel as the output energy storage capacitor, and the super farad capacitor can work at -50°C, and the capacity at this time can still reach 80% of the rated capacity.

The traditional bipolar control method (that is, working in the hard switching state), because the switch tube has to withstand high peak current and voltage, the switching loss and the safe operating area are very demanding, so this method is not suitable for high-power applications. . Therefore, the utility model adopts an advanced limited bipolar control ZVS-ZCS full-bridge topology circuit. This control method can make one pair of IGBT modules work in the ZCS state without loss, and the other pair of IGBT modules can work in the ZVS state without loss, which greatly reduces the switching loss and effectively solves the problem of high-power inverter. Critical issues in power supplies.

The utility model has the advantages of:

1. The number of starts is not limited. The charging and discharging current of the output energy storage capacitor is large and the time is short, unlike the battery that is limited by the charging time after the power is used up.

2. The starting temperature is low, the low temperature characteristics of the capacitor are less affected by the temperature, and the capacity of the battery at low temperature decreases a lot, only about 10% of the capacity at normal temperature.

3. No maintenance is required. Capacitor charging can be fully charged within a short time after starting up, and there is no need for charging and maintenance like batteries.

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model.

Detailed ways

See Figure 1.

A low-power input and high-power output starting power supply. After the three-phase AC passes through the AC-DC converter, the output DC is connected in parallel with a filter and energy storage circuit composed of resistors and capacitors, and then connected to four IGBT modules Q1, The input end of the full-bridge topology circuit composed of Q2, Q3, and Q4, the G pole and E pole of each IGBT tube are connected to the control drive circuit, and the control drive circuit controls the switch of each IGBT, and the bridge arms of the full-bridge topology circuit are connected in parallel There is a resonant capacitor; a tap of the primary coil of the transformer is connected between the E pole of the IGBT module Q3 and the Q pole of the IGBT module Q4 of the full bridge topology circuit through a protection circuit composed of a current transformer, a DC blocking capacitor, and a saturated inductance. The other tap of the primary coil of the transformer is connected between the E pole of the IGBT module Q1 and the Q pole of the IGBT module Q2 of the full-bridge topology circuit; the taps at both ends of the secondary coil of the transformer pass through the saturated magnetic beads respectively and are connected in series by a The absorption circuit composed of RC circuit and diode connected in parallel is then connected in parallel with each other; after the parallel connection, a filter reactance is connected in series, connected to the positive pole of the output energy storage capacitor, and the negative pole of the output energy storage capacitor is connected to the middle tap of the secondary coil of the transformer.

Claims (1)

1. a small-power is imported high-power output startup power supply, after it is characterized in that three-phase alternating current passes through AC-DC converter, the DC circuit two ends of output are parallel with filtering, the accumulator of resistance and electric capacity composition, be connected to the input of the full-bridge topological circuit of forming by 4 IGBT module Q1, Q2, Q3, Q4 then, the G utmost point and the E utmost point of each IGBT pipe are connected to control Driver Circuit, control the switch of each IGBT by control Driver Circuit, be parallel with resonant capacitance on the full-bridge topological circuit brachium pontis; A tap of the primary coil of transformer is connected to by the protective circuit of being made up of current transformer, capacitance, pulsactor between the C utmost point of the E utmost point of IGBT module Q3 of full-bridge topological circuit and IGBT module Q4, and another tap of the primary coil of transformer is connected between the C utmost point of the E utmost point of IGBT module Q1 of full-bridge topological circuit and IGBT module Q2; The two ends tap of the secondary coil of transformer is passed behind the absorption circuit that one of series connection behind the saturated magnetic bead is made of RC circuit and diode parallel connection parallel with one another more respectively; Back in parallel serial connection one filter reactance is connected to the positive pole of output storage capacitor, and the negative pole of output storage capacitor is connected on the centre tap of secondary coil of transformer.